H****s
发帖数: 160 | 1 they will come in couple of weeks.
1-1.5 million per acre, geez... | aw
发帖数: 127 | | c*******n
发帖数: 82 | 3 在地下的洞里呆着吧。小时候课文里好像学过，“昆虫记“？
可我觉得应该每年都有躲了17年的知了出动，这一回是一大批？可不吵死了。 | H****s
发帖数: 160 | 4 It's said to be natural selection. More precise, they come out all at once
to have better chance to mate. There are some small populations in other years,
but it's hard for their new generation to survive.
It's said the population this year would be about 1-1.5 million per acre on
woodland
【在 c*******n 的大作中提到】
: 在地下的洞里呆着吧。小时候课文里好像学过，“昆虫记“？
: 可我觉得应该每年都有躲了17年的知了出动，这一回是一大批？可不吵死了。
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