o**w
发帖数: 337 | 1 老三正手的主要问题，前面已有人指出，也与前不久bee谈论到的drop the racket毛病
类似，即拍头停置在最低点，对着来球再往上刷。
改进办法：把挥拍击球当作一个动作，takeback (or backswing) --->swing forward-
-->drop the racket head--->then swing from low to high--->accelerate &
increase the head speed---> hit--->follow-through 等等只是其中的环节，中间最
好不要停顿。
完成takeback之后，转腰与转肩积蓄能量(像上发条coiled spring一样，尔后向前挥拍
以释放那些能量)，如果挥拍中间需要停顿一下，那就是在takeback之后、释放任何腰
与肩部的能量之前，而不是在拍头降到最低点之后(drop the racket仅仅是为拍头加速
的步骤之一)。 |
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o**w
发帖数: 337 | 2 老三正手的主要问题，前面已有人指出，也与前不久bee谈论到的drop the racket毛病
类似，即拍头停置在最低点，对着来球再往上刷。
改进办法：把挥拍击球当作一个动作，takeback (or backswing) --->swing forward-
-->drop the racket head--->then swing from low to high--->accelerate &
increase the head speed---> hit--->follow-through 等等只是其中的环节，中间最
好不要停顿。
完成takeback之后，转腰与转肩积蓄能量(像上发条coiled spring一样，尔后向前挥拍
以释放那些能量)，如果挥拍中间需要停顿一下，那就是在takeback之后、释放任何腰
与肩部的能量之前，而不是在拍头降到最低点之后(drop the racket仅仅是为拍头加速
的步骤之一)。 |
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w**w
发帖数: 5391 | 3 ☆─────────────────────────────────────☆
zhanglaosan (张老三) 于 (Mon Oct 29 05:32:53 2012, 美东) 提到:
竟然体力不支，回家就闷头睡了，结果睡到半夜睡不动了，上BBS一看，老肯已经发来
编辑好的录像了，可惜第二个set只拍了几分钟就给关机了，所以主要是第一个set
体力不支主要原因不是跟老肯的比赛，就这场比赛而言本身还好，主要原因是
1，天气超级炎热
2. 赛前刚打了一场league联赛。我本来想，也就一双打，队长临时找不到人拉人问我
，我一想，正好热身啊，不错啊
没想到，这种超炎热天气连着打两场比赛对体力要求还是很高的
当然，这个不是啥借口，老肯号称更不擅长热天比赛，且，出门旅行，肯定热得也够呛。
球，输了，输的挺惨，感觉老肯老在网上经常“自贬“，还是很迷惑人的，老肯打得很
好，非常稳定，网前volley一般，但应付我足够，我volley更烂。进网小球老肯处理得
很老道，相反我这种球全部丢分。
发球，我现在依然双误频频，这个是我近期的新气象，以前是著名的不双误男。赛前练
发球老肯就在对面说，... 阅读全帖 |
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b*e
发帖数: 3845 | 4 Yeah, she is using modern (ATP) finish/follow through with WTA takeback/
foreward swing.That's I'm using right now. From the video where the coach
talked about difference between WTA & ATP forehand, it's still belong to WTA
forehand category (due to her backswing & forward swing before contact), so
is my forehand.
Also this video is pretty old, probably before she modified/improved both
forehand and backhand takeback. Now her forehand and 2hbh takeback is more
compact, which I like.
one
If |
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j**c
发帖数: 234 | 5 Every good stroke has 3 basic elements - balance, timing and rhythm. You
have pretty good balance and rhythm but lack good timing partly because you
take your racket back too far. In the backswing, your racket points to the
left fence. If your racket only points to the back fence, you will have
extra 90 degree and more time to hit the ball in front of you, and your
follow-through will be longer.
Although the ping-pong style straight takeback is ok, imo it is better
to use C type takeback... 阅读全帖 |
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发帖数: 1 | 6 【 以下文字转载自 SanFrancisco 讨论区 】
发信人: takeback (), 信区: SanFrancisco
标 题: 让板砖飞一会儿：驳“美国华人”支持江俊辉的神逻辑
发信站: BBS 未名空间站 (Mon Jun 4 12:52:53 2018, 美东)
让板砖飞一会儿：驳“美国华人”支持江俊辉的神逻辑
原创： 硅谷子非鱼 硅谷子非鱼 5天前
近日，公众号“美国华人”发表了署名文章“为什么我冒着被大家拍砖的风险支持江俊
辉(John Chiang)?”，文中表达了他/她是怎么从川普的支持者，转为支持加州州长民
主党候选人，华裔江俊辉的。当然作者写这篇文章，自己也在标题说了是“冒着被大家
拍砖的风险”，颇有我不入地狱谁入地狱的牺牲精神，大概是因为作者也知道江俊辉并
不是大多数华人的首选吧。 看到这个标题，我突然间想要学习一下到底作者是一个什
么思路，看看自己能不能换位思考，接受这样的逻辑。然而，看完之后，我突然觉得，
是应该扔几块砖了，希望能够轻轻砸醒一些执迷不悟的，被这样的神逻辑蛊惑的选民们
。当然，我们的砖是特制的，以理性对理性，以数字对数字，尽量不带感情色... 阅读全帖 |
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发帖数: 1 | 7 【 以下文字转载自 SanFrancisco 讨论区 】
发信人: takeback (), 信区: SanFrancisco
标 题: 错过了选民登记，还可以投票参与6/5的中期选举吗？
发信站: BBS 未名空间站 (Mon Jun 4 12:51:02 2018, 美东)
https://mp.weixin.qq.com/s/4Ny5Jhr6KV0FO8VN6J_L1Q
首先祝大家（迟到的）“六一儿童节快乐！”
几天前本号发了评论文章“让板砖飞一会儿：驳“美国华人”支持江俊辉的神逻辑”之
后，因里面派发了不少板砖，虽说是受人之托（应原文作者迫切要求，不忍拂面），忠
人之事（只好抛砖引玉），但对于不了解本人的朋友，尤其是只读了那一篇文章的，难
免会造成本人属于那种一言不合就板砖相向的印象......
虽说本人乃典型的抠脚大汉，说话喜欢直来直去，不喜欢猜人或者被猜，但是自认还是
相当“和蔼可亲”的！毕竟人在江湖飘，有理才能走遍天下，武力和砖块是不能解决问
题的，以理服人才是王道，故今天希望能向一般只看标题的朋友们澄清下：虽然我胡子
拉碴，但是我心柔软！
受到公众号“飞洋在线”要做... 阅读全帖 |
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v********c
发帖数: 953 | 8 如题，两周前list了一张100刀的gamestop gc，早收到check并cash了，结果今天收到
一封email说gc invalid,要takeback外加10刀fee，查了一下gc余额已经为0了，这算
scam吧？ |
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a****r
发帖数: 4965 | 9 From http://www.mcn.net/~jimloy/reviewc.html#def
DEFINITIONS OF TERMS
====================================================================
Definitions
Auction:
* hints Suggests a bid. yes/no.
* takeback Undo bid. yes/no.
conventions Significant optional conventions.
rebid Restart bidding. yes/no.
explain bids yes/no.
systems A list of bidding systems.
Abbreviations: SA = Standa |
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a*****g
发帖数: 19398 | 10 (转载)Why It's Hard to Create A Strong Go Software
For a long time it was a widely held opinion that computer Go posed a
problem fundamentally different to computer chess insofar as it was believed
that methods relying on fast global search compared to human experts
combined to relatively little domain knowledge would not be effective for Go
. Therefore, a large part of the computer Go development effort was during
these times focused on ways of representing human-like expert knowledge and
combini... 阅读全帖 |
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M******0
发帖数: 1280 | 11 你的体会很不错，好象是这样的.还有网球准备期，后摆（takeback)时拍头几乎是朝上
的，乒乓朝侧方。我儿子打乒乓就是有点朝上的 |
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o**w
发帖数: 337 | 12 恩，吸取agi的教训，以后比赛碰到13岁以下的小孩，我干脆先弃权。
感觉agi的球拍轻了一点，缺乏plow-through效能，建议先试一试340克(12oz.)、7-
8pts HL 左右的旧拍。版上奔过的高手如CC, dupont, ZZZ等均使用较重的拍(>350)，
就连像我这样的小个也用370多克的球拍。K6.1 team得加重，不然只能称为teen。
agi一发的进步在于有了转肩(shoulder turn)动作。正手可练练刷窗(windshield
wiper)和短小引拍(compact backswing/takeback)的抽球以对付较快的发球或来球。旋
转方面可结合强烈上旋、月亮软球和下旋切削以及线路的高低、左右、长短间的变化。 |
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b*e
发帖数: 3845 | 13 越看自己的正手越别扭，以下是TW高手对我的建议，觉得很有道理，正在琢磨怎么改进。
"On your forehand, be more deliberate with the stroke.
By that I mean
1) Don't flip the racket around on your take back like you were doing in the
video (the racket is flipped almost backwards on your takeback).
2) Hit the ball in front of you. You were making contact on a lot of
forehands behind you.
3) Use the same follow through every time. I saw a few over the shoulder, a
Nadal-esque wrapping around the head, as well as some in between.
Decide on what |
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c****h
发帖数: 590 | 14 Can you sync your racket takeback with the trajectory of the ball? (start
taking back as the ball leaves the opponent's racket, and finish the back
swing as the ball bounces)
up, |
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b*e
发帖数: 3845 | 15 compact & straight takeback without any loop on both sides.
it looks awkward but is very effective. |
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x*d
发帖数: 1696 | 16 有个小tip很有用，如果你的教练还没提到的话。
左手不要和右手分开太早。转身的时候，左手要一直托到拍子上，直到左肘刚刚贴到肋
骨（半开放站位），这个时候一般左手和肩的联线和底线是平行的，然后左手打开（身
体旋转的反方向）。这样有n多好处。
（1）你不用管右手大臂是夹不夹了，因为两只手在一起，左手限制了右手，右手必然
是最自然的角度。
（2）同样的，两手的限制让你不得不转肩，转肩才有pace
（3）你不得不做looping takeback，你现在的引拍是钟摆式的，该改了。
（4）这样你的引拍必然会慢了，强迫提前准备
（5）身体旋转停止，左手还在旋转，自然带动身体的反向旋转发力。节奏感自然就出
来了。很多运动其实一样，最后就是个节奏感。
我也悟到不久。 |
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d*g
发帖数: 16592 | 17 可能就是楼上说的，setup时候drop得不够，你试试setup之前就足够drop，（手腕放松
），不知道会不会好一些。
我从前反手有这个毛病，不过现在不划圈了，直接takeback，好了一些。 |
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x*d
发帖数: 1696 | 18 我觉得最大的毛病是转肩不够, 有些靠胳膊打。
我觉得单反最重要的一点就是转肩。无论是直臂还是曲臂击球，单反中胳膊自身是很难
产生力量和旋转的，即使强加也是控制不稳定的力量和旋转。高级技巧比如acc28转屁
股学说也有用处。
转肩两个方面都要作好，准备的转和击球的转，就是takeback rotation和swing
rotation。基本上是转的多力量就大，转的舒服从容控制就好。
你的准备稍微有点仓促，不过打墙本身这点就比较难。可以转多一点，你现在是和底线
成直角，实际上是可以超过直角，甚至稍背对墙。击球的时候转肩也不足，击球完毕你
的肩膀也没有完全打开，感觉是硬着肩膀打球。
你的球的力量有很大一部分是胳膊挥出来的，所以即使有速度也不是很可靠，拉到多拍
的化出错的可能性很高。正确的是肩要早转，多转，要有那么0。1秒感觉自己是在侧背
对球等着，击球的时候是肩带动手臂，一定要先转肩后转臂，感觉自己胳膊是放松的甩
出去的，击球结束必然是完全打开的。接发球除外。
如果再加上acc的屁股理论，击球前肩和臀成一个力量夹角，击球时转的顺序是，屁股-
>肩膀->胳膊。
Wawrinka's slow ... 阅读全帖 |
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z*****k
发帖数: 600 | 19 Steps, racket takeback, coiling, all occur at the same time. |
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b*e
发帖数: 3845 | 20 Although I seldom do mini tennis, I think the reason for minimum takeback is
one can feel the wrist layback at contact position (in the front). Here is
an pretty old video of Justin Henin doing mini tennis. At the very beginning
, notice her laying back wrist right away with minimum take back (especially
at 0:25, where she hold the wrist lay back position to wait for the ball).
I need to try it sometime. Even for ATP style forehander, laying wrist back
early during warmup/practice will help one ... 阅读全帖 |
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b*e
发帖数: 3845 | 21 I agree that Konta's forehand takes less time to prepare. But I think she is
using a compact version of WTA forehand. It looks like she lays back wrist
really early during takeback, this is the most characteristic of WTA
forehand. Her follow through is windshield wiper, which is modern follow
through. With racquet face closed, she can generate more topspin, thus her
Forehand has better control than Zhang Shuai.
Interestingly Konta's 2hbh is very similar as her forehand, as she lays back
her wris... 阅读全帖 |
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b*e
发帖数: 3845 | 22 Interesting.
From my definition of ATP forehand, it's not ATP forehand
From 黑导's definition, it might be.
She is laying back wrist during early stage of takeback (without even
raising the racquet head).
This could be a very consistent forehand. But not much topspin as real ATP
forehand. |
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b*e
发帖数: 3845 | 23 No, I probably don't want to make my palm facing down during the takeback or
make racquet head pointing toward net. I prefer palm facing 45 degree down,
racquet facing side fence during take back. [Palm facing very very down]
only happens during racquet drop, when butt cap is facing net. |
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M******0
发帖数: 1280 | 24 Prepare, prepare, and prepare earlier
load, load, and load on your takeback |
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w********1
发帖数: 3492 | 25 Sat, 14 Jul 2012 10:47:35 PDT
Yesterday, Apple reversed course on their decision to remove their products
from the EPEAT Environmental Registry. In a letter recognizing the move as
a "mistake", Senior Vice President of Hardware Engineering Bob Mansfield
reported that all eligible Apple products are now back on the registry.
The new Retina MacBook Pro was notably included in the "Gold" level status
which represents the highest rating from EPEAT.
Retina MacBook Pro battery via iFixit
Fortune, h... 阅读全帖 |
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