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Caterpillar
毛虫
Have you seen baby butterflies? Probably not.
你见过蝴蝶宝宝吗？应该没有。
This is because an adult butterfly has never been a baby butterfly.
这是因为成年的蝴蝶压根就不是由蝴蝶宝宝长成的。
Then, how did the adult butterfly grow up?
那么，成年蝴蝶是如何长大的呢？
Butterflies, moths and some other insects once were caterpillars.
蝴蝶、飞蛾和其他昆虫曾经都是毛虫。
Caterpillars are born out of eggs.
毛虫是卵生的。
They usually eat tree leaves, but some of them also eat other caterpillars or small insects.
它们通常吃树叶，但它们有的也吃其他毛虫或小型昆虫。
The caterpillars eat a lot, so they are sometimes called "eating machines".
毛虫很能吃，所以它们有时被戏称为“吃东西的机器”。
When caterpillars get old enough, they change their forms into adult butterflies or adult moths.
毛虫长大的时候，它们就会变成年蝴蝶或飞蛾。
