1801 篇文章
The cicadas have no defenses and virtually offer themselves to their attackers.
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The cicadas have no defenses and virtually offer themselves to their attackers. 蝉毫无防卫而且好像是 把自己送上门供享用

but they have until dawn to complete their transformation.
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but they have until dawn to complete their transformation. 直到黎明它们才完全转化完毕

The nymphs of the periodical cicada have been biding their time.
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The nymphs of the periodical cicada have been biding their time. 布鲁德X蝉(一种周期蝉)的若虫 为这个机会等待了很长时间

They have waterproof scales, instead of needles and their cones look a little different
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They have waterproof scales, instead of needles and their cones look a little different 它们用防水的鳞片代替了针叶.球果也有些不同

Some have been here for five thousand years.
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Some have been here for five thousand years. 有的在这里已经待了5000年

So now, let's have another go.
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So now, let's have another go. 现在,可以再来一次了

but to see coniferous trees that have reached their full potential you must travel a thousand miles south of here.
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but to see coniferous trees that have reached their full potential you must travel a thousand miles south of here. 不过想要一览针叶林的全貌, 你要还要再向南走1000英里

Each may have just a single chance to impress a female.
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Each may have just a single chance to impress a female. 只有一个机会来取得雌鸟的芳心

Once the mother and calf have reached their feeding grounds, they will separate.
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Once the mother and calf have reached their feeding grounds, they will separate. 一旦母鲸和小鲸到达他们的给养地 它们就要分开

The humpbacks have finally arrived.
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The humpbacks have finally arrived. 座头鲸终于抵达