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. 直到黎明它们才完全转化完毕
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 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. 有的在这里已经待了5000年
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. 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. 一旦母鲸和小鲸到达他们的给养地 它们就要分开