But soon this dry case bursts open, and out comes a full-grown fly.

但是很快, 这层干燥硬壳就会破开, 爬出来苍蝇“虫”。

You see, flies, as with most insects, undergo a complete metamorphosis from egg to adult via a larvae and a pupal stage.

苍蝇，和多数昆虫一样，经历幼虫和蛹阶段，完从卵到虫完全蜕变。

And those bigger larvae resulted in bigger adults.

那些更幼虫导致更虫。

For one, it keeps larvae and adults from competing for the same habitats and food sources.

一方面，可以防止幼虫和虫争夺相同栖息地和食物来源。

Over the following weeks, her larva hatches, bores into the cockroach, eats it alive, pupates in its carcass, and emerges as an iridescent adult.

在接下里几周内，幼虫孵化，钻进蟑螂躯体，活吃蟑螂，在体中化蛹，再以虫形态闪亮登场。

This lets adult and juvenile traits evolve independently from each other, since caterpillars and butterflies face totally different pressures for natural selection.

这使得虫和幼虫性状可以相互独立进化，因为毛虫和蝴蝶面临着完全不同自然选择压力。

Estimating the PMI in this case relied on analyzing the life cycle of flies through development from egg to adult can be predicted based on environmental conditions.

在这种情况下，估计 PMI 依赖于分析果蝇从卵到虫生命周期，可以根据环境条件进行预测。

Insects hatch from eggs, and although some insects hatch as basically small versions of the adults of their species, others go through an incredible change before adulthood.

昆虫是由卵孵化而来，虽然有些昆虫在孵化时，幼虫就是同类虫微缩板，但有些昆虫在年之前会发生翻天覆地变化。

Certain variations can only appear at corresponding ages; for instance, peculiarities in the caterpillar, cocoon, or imago states of the silk-moth; or, again, in the full-grown horns of cattle.

某些变异只能出现在相应年龄；例如，蚕蛾毛虫、茧或虫状态特殊性； 或者，再一次，在牛熟角中。

What actually happens when a caterpillar morphs into a winged marvelous adult is so flippin' cool, some of nature's most remarkable biological processes and all of that mind blowing stuff happens in this part that the book just skips over.

当毛毛虫变有翅膀奇妙虫时，实际发生事情是如此酷，自然界一些最非凡生物过程和所有令人兴奋事情都发生在这一部分，这本书只是跳过了。