发帖数: 1 | 1 The annual range of water-level fluctuations is considerable—an average of
about 65 feet (20 metres)—with 26 to 35 feet (8 to 11 metres) during years
of low water.
汛期涨水平均20米，水少的年度10米。 |
|
发帖数: 1 | 2 In the delta tides exert the greatest influence on the water level. Near the
city of Wusong the daily tidal range is 15 feet (4.5 metres), and the
yearly range is 20 feet (6 metres).
长江三角地段潮水最影响水深，每天潮水高达5米，每年最高达6米。 |
|
发帖数: 1 | 3 The annual range of water-level fluctuations is considerable—an average of
about 65 feet (20 metres)—with 26 to 35 feet (8 to 11 metres) during years
of low water.
汛期涨水平均20米，水少的年度10米。 |
|
f*****e
发帖数: 149 | 4 现代潜射战略导弹，直径近２米，长度１０米以上，重量好
几十吨，哪来那么大鱼雷发射管。。。在潜艇内部移动这样
的大家伙也不现实。
美帝的TridentII
Height 13.41 metres (44.0 ft)
Diameter 2.11 metres (83 in)
Mass 58,500 kilograms (129,000 lb) |
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c****s
发帖数: 24 | 5 不过看了最后一句话，看来两个中国选手是有战术的
Olympics-Athletics-I thought I'd won, says stunned Dibaba
By Sabrina Yohannes
ATHENS, Aug 27 (Reuters) - Ethiopia's Ejegayehu Dibaba was convinced she had
won the women's Olympic 10,000 metres on Friday until an official explained
that she had taken only the silver medal.
Dibaba was overtaken by China's 20-year-old Xing Huina in the last 100 metre
s of the race but thought she was a lapped runner.
She was asked by an official as she approached reporters: "You are the one |
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t*n
发帖数: 14458 | 6 这个就叫做loser
Olympics-Athletics-I thought I'd won, says stunned Dibaba
By Sabrina Yohannes
ATHENS, Aug 27 (Reuters) - Ethiopia's Ejegayehu Dibaba was convinced she had won the women's Olympic 10,000 metres on Friday until an official explained that she had taken only the silver medal.
Dibaba was overtaken by China's 20-year-old Xing Huina in the last 100 metres of the race but thought she was a lapped runner.
She was asked by an official as she approached reporters: "You are the one who came secon |
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y******u
发帖数: 804 | 7 逻辑和时态有点绕，又感觉规则本身就没说清楚。
规则在国际自联官网
http://www.uci.ch/Modules/BUILTIN/getObject.asp?MenuId=MTkzNg&O
辅助条款
The leading rider shall lead the first lap and move towards the outside of
the track and then drop back to leave the track without hindering the other
team.
Women:（男子需要3人，规定再多一点。未免混淆，这里就不掺和进来了）
The second rider shall end the last lap alone.
主要犯规的条款
A team shall be relegated to the last place in the stage of the competition
if one of the following infringements has been committed: （注意这个单词
relegat... 阅读全帖 |
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a*****a
发帖数: 415 | 8 From Wikipedia:
Freestyle means "any style" for individual swims and any style but
breaststroke, butterfly, or backstroke for both the individual medley, and
medley relay competitions. The wall has to be touched at every turn and upon
completion. Some part of the swimmer must be above water at any time,
except for the first 15 metres after the start and every turn. This rule was
introduced (see History of swimming) to prevent swimmers from using the
faster underwater swimming to their advantage,... 阅读全帖 |
|
g*********r
发帖数: 403 | 9 From Wikipedia, the free encyclopedia
Jump to: navigation, search
The examples and perspective in this article may not include all
significant viewpoints. Please improve the article or discuss the issue. (
July 2010)
Unbalanced scales.svg
The neutrality of this article is disputed. Relevant discussion may be
found on the talk page. Please do not remove this message until the dispute
is resolved. (October 2008)
A Ford Excursion SUV next to a Toyota Camry
Sport utility vehicles (SUVs), tru... 阅读全帖 |
|
x**********i
发帖数: 4964 | 10 There are two 60 meter/200 ft tall glass silos (AutoTürme) used as storage
for new Volkswagens. The two towers are connected to the Volkswagen factory
by a 700 metre underground tunnel. When cars arrive at the towers they are
carried up at a speed of 1.5 metres per second. The render for the Autostadt
shows 6 towers. When purchasing a car from Volkswagen (the main brand only,
not the sub-brands) in select European countries, it is optional if the
customer wants it delivered to the dealership whe... 阅读全帖 |
|
G*****h
发帖数: 33134 | 11 1m 英镑，装13装过头了
Quant e-Sportlimousine's top speed is 217mph - equal to a McLaren P1
The car uses a saltwater flow cell system to power four electric motors
Water passes through membrane in tanks creating an electric charge
Two 200-litre water tanks can provide a range of 373 miles (600km)
The four-seater is 5.25 metres (0.4ft) long and 2.2 metres wide (7.2ft)
Price and sale date yet to be confirmed, but may cost more than ￡1m |
|
b*****d
发帖数: 61690 | 12 http://www.cbisociety.org/
Nature should adhere to fact-based and unbiased reporting
Philip Campbell, Ph.D.
Editor-in-Chief, Nature
Dear Dr. Campbell:
We write on behalf of the Chinese Biological Investigators Society (CBIS) to
express our deep concern regarding a recent news article, titled "Why great
Olympic feats raise suspicions" (www.nature.com/news/why-great-olympic-
feats-raise-suspicions-1.11109, August 1, 2012), in which Ewen Callaway
discussed the performance of Ye Shiwen, a 16-year ol... 阅读全帖 |
|
y*****d
发帖数: 4451 | 13 Living near high-voltage power lines raises children's risk of leukemia by
69 percent, a British study shows.
Read more: http://www.foxnews.com/story/0,2933,158457,00.html#ixzz2KhYIJWX0
200 meters!
Further than 600 meters, nobody knows.
The B.C. authors focus on a 2005 British study which found that there is an
increased risk of 69 per cent for leukemia in children living within 200
metres of power lines. The risk is increased to 23 per cent if children live
200 to 600 metres of the lines.
Read ... 阅读全帖 |
|
p******s
发帖数: 2552 | 14 ebay上某几个山寨牌子的油烟机已经悄然将参数改了，从900CFM改成500CFM。联系卖家
得知原来厂家把cubic meter per hour误认成cubic feet per minute，终究还是中美
单位不统一的原因。
1 CFM = 1.7 cubic metre/hour，如此529 CFM =900 cubic metre/hour，卖了这么久
了才纠正，可怜mitbbs将众多山寨神器二代当做神器二代如此之久。涉及品牌包括但不
限于GTC, golden vantage,Akdy以及更多无品牌的型号。
这类误标的产品可能有某个特点，就是功率偏低，200w不到甚至只有170w。据说神器一
代的参数是600CFM，那么所谓山寨神器其实只有一代不到的水平...
普通人用可能感觉不出来，因为没个比较，如果你偶然用过朋友或邻居家900CFM的型号
才会体会到差距。 |
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t****2
发帖数: 306 | 15 好像A340可以呀, 这两个都能从波士顿起飞到北京，看来希望还有A340了
A340-200
max range: 8,000 nautical miles (15,000 km; 9,200 mi)
take off run:2,990 metres (9,810 ft)
A340-500
max range: 8,670 nautical miles (16,060 km; 9,980 mi)
HGW: 9,000 nautical miles
take off run: 3,050 metres (10,010 ft) |
|
x********o
发帖数: 1442 | 16 【 以下文字转载自 Olympics 讨论区 】
发信人: xiaobenmao (水晶瓶子), 信区: Olympics
标 题: 对Nature失望透顶
发信站: BBS 未名空间站 (Thu Aug 2 14:20:55 2012, 美东)
Nature太让我失望了，竟然发了这么一篇无论逻辑还是数据分析都漏洞百出的的狗屎文
章。
At the Olympics, how fast is too fast? That question has dogged Chinese
swimmer Ye Shiwen after the 16-year-old shattered the world record in the
women's 400-metre individual medley (400 IM) on Saturday. In the wake of
that race, some swimming experts wondered whether Ye’s win was aided by
performance-enhancing drugs. She has n... 阅读全帖 |
|
b**********n
发帖数: 53 | 17 去过 New Orleans 了.住在Days inn in Harvey.很便宜,还有Microwave
refrigerator,Coffee pot and free breakfast.街对面就是同庆中国店.New Orleans 文
化气息浓,挺繁华.只有一件事不爽,星期六早上downtown parking,有人说metre 不用钱,
我明明把车停在一个旁边有metre 白线区域内,却有一张Ticket.$45.我的车是租来的.而
且我先前在车里坐了2小时,根本没警察对我说有问题,等到中午去吃饭回来,去有了Ticket
.搞到后来游玩心情也没了. 请问有办法和Parking Department argue 吗? 他们很严格吗
? |
|
E****t
发帖数: 184 | 18 Hurricane or typhoonA hurricane or typhoon (sometimes simply referred to as
a tropical cyclone, as opposed to a depression or storm) is a system with
sustained winds of at least 33 metres per second (64 kn) or 74 miles per
hour (119 km/h).[15] A cyclone of this intensity tends to develop an eye, an
area of relative calm (and lowest atmospheric pressure) at the center of
circulation. The eye is often visible in satellite images as a small,
circular, cloud-free spot. Surrounding the eye is the eye... 阅读全帖 |
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g****e
发帖数: 579 | 19 如果你家装的是smart metre的话，PG&E不用到后院查表，现在基本都是smart metre，
除非你愿意多交查表费，按普通电表。 |
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i*****s
发帖数: 15215 | 20 Search in a ‘floating feet’ case leads to troubled young man from Surrey,
B.C.
Tristin Hopper Sep 2, 2011 – 7:00 AM ET | Last Updated: Sep 2, 2011 10:33
AM ET
As Talib rounds a corner on Surrey, B.C.’s Annacis Highway, his destination
comes into view on the edge of the horizon. Although they stretch up to 150
metres from the Fraser River, from this distance the two towers of the Alex
Fraser Bridge look like nothing more than tuning forks.
When Talib (not his real name) left his parents’ suburban... 阅读全帖 |
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D****R
发帖数: 6053 | 21 Have you heard of Bay of Fundy? It is in NE...
“The Natural World, Greatest Tides: The greatest tides in the world occur
in the Bay of Fundy.... Burntcoat Head in the Minas Basin, Nova Scotia, has
the greatest mean spring range with 14.5 metres (47.5 feet) and an extreme
range of 16.3 metres (53.5 feet).” |
|
ET
发帖数: 10701 | 22 * Card of the Course
Hole Par Yards Metres
1 4 459 420
2 5 550 503
3 4 362 331
4 3 200 183
5 4 463 423
6 3 200 183
7 4 346 316
8 5 603 551
9 4 466 426
OUT 36 3649 3336
Hole Par Yards Metres
10 4 401 367
11 4 435 398
12 3 217 198
13 4 430 393
14 5 |
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c******n
发帖数: 16403 | 23 本帖最后由 野鹤闲云 于 2011-8-27 06:53 编辑
2011年8月6日
今年K2攀登分为南北两侧。南边经过艰难准备，大约11名攀登者于今晨冲顶。原来天气
预报天气应不错，但实际是强风，根本不能冲顶。攀登者们别无选择，只能放弃。经过
5个小时已安全下撤到大本营。南面的K2攀登基本宣告结束。北面的著名登山女将
Gerlinde Kaltenbrunner等三人还没到达突击营地，目前还不知他们今后几天计划。K2
自2008年大灾难以来已两年无人登顶，今年结果如何，要看Gerlinde Kaltenbrunner他
们的结果。Gerlinde Kaltenbrunner已完成13座8000米山峰，K2是她最后一座。在所有
攀登中，她都是无氧攀登，没有大团队，而且经常选择非常规线路，是登山女性中的佼
佼者。
2011年8月8日
据最新消息，Kaltenbrunner他们在C4营地休息了一天等待。在这么高的海拔滞留一天
很不寻常，所以今天（8月8号星期一）必须面临的决定是：冲顶或下撤。目前还不知他
们今天凌晨做了怎样的决定。今年是Kaltenbrunner第4次攀登K2。
因为周日降了... 阅读全帖 |
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b***i
发帖数: 10018 | 24 From wiki, it's related to Lydiard:
The work Arthur Lydiard did in the late 1960s in Finland is generally
acknowledged to have led to the renaissance in Finnish distance running in
the 1970s (with Lasse Virén winning gold in both the 5000 metres and 10,000
metres at the 1972 Olympics and the 1976 Montreal Olympics)
During a trip to New Zealand in 1962, Bowerman was introduced to the concept
of jogging as a fitness routine through a jogging club organized by his
friend and coaching colleague Arth |
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i*********5
发帖数: 19210 | 25 今天正好夏令时改时间，早上多睡了一个小时，休息得特好。吃个全麦Bagel夹花生酱，喝了杯牛奶，还吃了个胖妞他爷爷烙的饼。去Angus Glen Golf Course的路上还吃了半块PowerBar，剩下的半块赛前15分钟热身时吃了。（本想带Gel的，结果昨晚找了N个supermarket都没找到。）
Golf Club的前门封了路，大家都走后门，窜过一大片荒地，才开到了高尔夫球场后面的一空地临时停车场。停好车看时间只有半小时了，就把胖妞丢给了她妈，我自己先狂奔去了。穿过高尔夫球场和一条小溪，爬上一小坡，就到了club house。进去领上timing chip，戴上，然后上厕所又放了点儿水。
来到club house门口的Start/Finish区只剩下15分钟了，人已经多起来了。随便再跑了跑，热了个身。但是人多，路段，跑不起来，心想算了，要跑21.1公里了，头一公里就当热身好了。
还有五分钟时，race director开始叫跑得最快的选手去line-up排队了。我也就漫不经心地过去了。赛前几天跟一朋友聊过，他去年得的第四，说我排在第四第五片排就可以了。于是我就遛到了第四排站着。这... 阅读全帖 |
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d***o
发帖数: 761 | 27 摘要：
1）跑步可比吸大麻
2）runner's high 在其他动物也有
http://www.economist.com/node/21552536
Exercise and addiction
Fun run
People, it seems, have evolved to be addicted to exercise
Apr 14th 2012 | from the print edition
You expect me to what?!
AS THE legions of gym bunnies and jogging enthusiasts who race out into the
spring sunshine every year clearly demonstrate, running can be fun. More
specifically, running triggers the release of brain chemicals called
endocannabinoids that create a potent feeling of plea... 阅读全帖 |
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r********r
发帖数: 2912 | 28 "According to the rules, a marathon measures 42.195 kilometres. This is a
requirement for any potential world record to be validated by the IAAF.
Measurers build in a factor of 0.1% to prevent race courses from being
determined too short in re-measurements. As a consequence, a “marathon
kilometre” equals 1001 metres during measuring. If measured precisely, all
marathon race courses are therefore actually 42.237 kilometres. The extra 42
metres are designed to make up for possible measuring flaws... 阅读全帖 |
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j****7
发帖数: 3032 | 29 "The main difference between these areas and Utah and Hokkaido is the volume
of snow. Many of the resorts in Utah such as Alta, Snowbird and Park City
receive around 500 inches on average (around 13 metres) whilst ski resorts
in Hokkaido such as Niseko accumulate an average of 15 metres (590 inches).".
这应该说的就是降雪量吧。
再看看这篇：
http://www.wunderground.com/blog/weatherhistorian/comment.html?
Here is a list of the 10 snowiest locations in the U.S. by annual average
snowfall (various periods of record):
... 阅读全帖 |
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d**y
发帖数: 18174 | 30 嗯，学习了。美国的小山都排前面去了。跟美帝的奥运会奖牌排名有一拼哪。
珠穆朗玛峰为什么可以例外？如果不跟海平面比，是多少名？
By convention, the prominence of Mount Everest, the Earth's highest mountain
, is taken to equal the elevation of its summit above sea level. Apart from
this special case, there are several equivalent definitions:
The prominence of a peak is the height of the peak’s summit above the
lowest contour line encircling it and no higher summit.
If the peak's prominence is P metres, to get from the summit to any higher
terrain one must desce... 阅读全帖 |
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E******u
发帖数: 3920 | 31 来自主题: LeisureTime版 - 两座叹息桥 搜了一下，有那么许多的叹息桥：
http://en.wikipedia.org/wiki/Bridge_of_Sighs
The name "Bridge of Sighs" has since been applied by association to other
similar covered bridges around the world, including:
Puente de los Suspiros ("Bridge of Sighs" in Spanish), a bridge in the city
of Barranco, Lima, Peru, which Renzo insists is the true Puente de los
suspiros.
A bridge in Cambridge, England
A bridge in Oxford, England
A bridge in Stockholm, Sweden
A bridge in Frankfurt am Main, Germany
A bridge in the Santa Barba... 阅读全帖 |
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z**c
发帖数: 7595 | 32 往Nature灌水那是一大波人的终身梦想，包括我的老板 ：）
http://club.kdnet.net/dispbbs.asp?page=1&boardid=1&id=8518328
------------
Why great Olympic feats raisesuspicions
""""Performanceprofiling"""" could help to catch cheaters in sport.
· Ewen Callaway
01 August 2012
At the Olympics,how fast is too fast? That question has dogged Chinese
swimmer Ye Shiwen afterthe 16-year-old shattered the world record in the
women""""s 400-metre individualmedley (400 IM) on Saturday. In the wake of
that race, some swimming expe... 阅读全帖 |
|
y*****d
发帖数: 4451 | 33 Living near high-voltage power lines raises children's risk of leukemia by
69 percent, a British study shows.
Read more: http://www.foxnews.com/story/0,2933,158457,00.html#ixzz2KhYIJWX0
200 meters!
Further than 600 meters, nobody knows.
The B.C. authors focus on a 2005 British study which found that there is an
increased risk of 69 per cent for leukemia in children living within 200
metres of power lines. The risk is increased to 23 per cent if children live
200 to 600 metres of the lines.
Read ... 阅读全帖 |
|
t******n
发帖数: 2939 | 34 ☆─────────────────────────────────────☆
shouruo (shouruo) 于 (Thu May 2 16:24:51 2013, 美东) 提到:
吵了这么久，其实这两个人的面目还是云山雾罩的模糊。
网络同情弱者，美化包装受害人，不乏感情泛滥的抒情和讴歌：大约貌比西施，才压沫
若，很有获得诺贝尔奖的可能～～～体育也专业。家境好，对同学友善，阳光灿烂。。
。。。
但是，这些有多少是真的？就性格上来讲，先不说家里姐姐的去世在心里是否留下了一
道阴影，也不说在高中同学关系如何（因为我们资料太少），仅凭在大学透露出来的一
点信息，我们就能看到一个大致的模样：
和周围同学关系极度紧张，尤其同性同学之间，也就sw勉强算得上是朋友。文艺团如何
，是否有同性朋友，资料太少，不得而知。大概是一个只有男朋友和几个异性朋友但是
缺乏同性朋友的人。（大家如果有新资料，欢迎补充。我资料太少，可能说的不对）
反观sw，和同学关系好，平等待人，常请外地同学去家里玩，并且不显摆自己高干后代
的身份。多年以后，还能有那么多同学出来为她背书，就是一个证明。能和zl算得上... 阅读全帖 |
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f**********r
发帖数: 3774 | 35 6 feet 3 inch = 1.90500 metres
6 feet 2 inch = 1.8796 metres |
|
f**********r
发帖数: 3774 | 36 6 feet 3 inch = 1.90500 metres
6 feet 2 inch = 1.8796 metres |
|
|
X****i
发帖数: 492 | 38 【 以下文字转载自 Olympics 讨论区 】
发信人: XianDi (先帝), 信区: Olympics
标 题: Re: nature的原文可以找到么
发信站: BBS 未名空间站 (Fri Aug 3 09:30:00 2012, 美东)
找到了：
Why Great Olympic Feats Raise Suspicions: Scientific American
“Performance profiling” could help catch athletes who use banned performan
ce-enhancing drugs
From Nature magazine
At the Olympics, how fast is too fast? That question has dogged Chinese swim
mer Ye Shiwen after the 16-year-old shattered the world record in the women'
s 400-metre individual medley (400 IM... 阅读全帖 |
|
y***i
发帖数: 11639 | 39 道歉还挺全面的，包括了副标题。把原来的editor note剔除了。看来是比较全面的胜
利了！！！！
his article has drawn an extraordinary level of outraged response. The
volume of comments has been so great that our online commenting system is
unable to cope: it deletes earlier posts as new ones arrive. We much regret
this ongoing problem. The disappearance of some cogent responses to the
story has fuelled suspicions that Nature is deliberately censoring the
strongest criticisms. This is absolutely not the case: Nature welcomes
critically min... 阅读全帖 |
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m**e
发帖数: 857 | 40 华人生物学家协会出面要求撤稿
http://www.cbisociety.org/
Nature should adhere to fact-based and unbiased reporting
Philip Campbell, Ph.D.
Editor-in-Chief, Nature
Dear Dr. Campbell:
We write on behalf of the Chinese Biological Investigators Society (CBIS) to
express our deep concern regarding a recent news article, titled "Why great
Olympic feats raise suspicions" (www.nature.com/news/why-great-olympic-
feats-raise-suspicions-1.11109, August 1, 2012), in which Ewen Callaway
discussed the performance of Ye Shiwe... 阅读全帖 |
|
m*****n
发帖数: 3575 | 41 可中国人当了几百年的东亚病夫； 到现代医学发现了免疫系统
Ironically, this is a disproof of your assumption.
The Qin Solder Idol and many other tombs revealed Chinese used to have 1.85
metres tall on average for mature males. While the Roman Solders were only 1
.70 metres tall.
It can be seen gradually Chinese lost their physical power. One good
explanation is Chinese Med preserved so many ancient Chinese who were
supposed to die before giving birth or giving several births that gradually
Chinese lost evolution in physical |
|
g**********r
发帖数: 1654 | 42 上周末，我再一次为Ironman Wales做志愿者。这次我的位置是在transition area，因
此几乎没有机会观看比赛。导致连谁赢了比赛都不知道。。。
收获最大的是这次在版大的介绍下有幸见到了他的朋友David D，学到了很多，再次特
别感谢版大！版大的朋友果然都很牛！！！
这里记录一下学到的东西和一些感想。
1. 版上对三项有兴趣的同学们，有条件的话，我强烈建议你们去做一下附近triathlon
event的志愿者。这不仅是对tri社区的回馈，也是掌握一手学习经验的好机会，同时
你极有可能被参赛者inspired，从此就hook up了。
2. Know your bike course: pre-ride your bike course beforehand will save you
a lot of time. The most important thing is this might help you to avoid
accident. There are quite a few bike accidents. Most of these happened a... 阅读全帖 |
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r*****s
发帖数: 184 | 44 Lobster and roast lamb were on the menu, along with shrimp, pheasant,
chocolate mousse, chicken soup, two kinds of cake, dates and dozens of other
dishes laid out along a t that ran for yards (metres).
1.lobster and lamb
2.Chocholate mousse
3. pheasant (实物和食物）
etc |
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S*********n
发帖数: 4050 | 45 http://www.guardian.co.uk/world/2008/mar/15/tibet.china2
This is an eyewitness account of a foreign resident in Lhasa who took refuge
in a hotel close to the centre of the Tibetan capital yesterday. The city
was gripped by violence after protesters and police clashed
"Oh my God. Oh no. That's crazy. One hundred people are trying to stone one
man. A man was trying to cross the street with his motorcycle - they were
trying to stone him but it's so crowded I can't see whether they got him or
not.
"... 阅读全帖 |
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d******a
发帖数: 32122 | 46 【 以下文字转载自 Military 讨论区 】
发信人: didadida (滴滴嗒嗒), 信区: Military
标 题: [合集] 朱令的凶手特征
发信站: BBS 未名空间站 (Sat Apr 20 23:18:57 2013, 美东)
☆─────────────────────────────────────☆
comethalley (Nobody) 于 (Wed Apr 17 12:59:35 2013, 美东) 提到:
要确定投毒的人，
有三个条件要具备：
第一， 要非常恨朱令， 毕竟下两次毒不是一般人能做出来的。 看看平时的言行就知
道了，那个宿舍同学的关系。
第二， 要知道铊的危害性，并且事先已经知道铊盐在哪里。 如果不是预先知道铊盐的
危害，并且知道铊盐在哪里。 选择投毒的时候，就不会选择铊盐的。 毕竟天下毒物很
多， 铊盐也不是唯一的暗器。 查到铊盐的危害，特地跑到实验室里去找着铊盐， 好
象不大可能。 最可能的是看到铊盐的存在后，然后知道其的危害性， 非常恨朱令，
就决定投铊盐了。
第三: 有机会投毒， 有针对性投毒的只能是身边比较亲近的人。... 阅读全帖 |
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d*****g
发帖数: 441 | 47 12,000-year-old mine found in Chile
Posted Mon Dec 6, 2010 10:56am AEDT
Archaeologists from the University of Chile have discovered a 12,000-
year-old iron oxide mine in the north of the country.
Researchers say it is the oldest mine discovered in all the Americas.
Chief researcher Diego Salazar said the iron oxide was used by
Huentelauquen Indians as a pigment in dying cloth and in religious
rituals, revealing an unexpected sophistication in what was previously
considered a primitive group of p... 阅读全帖 |
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e********3
发帖数: 18578 | 48 By the time of the Roman Republic, which flourished during the Iron Age, the
classical world was well-acquainted with steel and the steel-making process
. Pure iron is relatively soft, but pure iron is never found in nature.
Natural iron ore contains various impurities in solid solution, which harden
the reduced metal by producing irregular-shaped metallic crystals. The
Gladius is generally made out of iron, while the ones carried by officers
were often of higher quality and made out of bronze o... 阅读全帖 |
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x*****n
发帖数: 3422 | 49 绿色部分中美各占一大块，地中海两河流域啥的就那么窄一条。
Average solar irradiance, watts per square metre. |
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