当毛毛虫变成蝴蝶的时候，茧里发生了什么仍然是自然界最大的秘密之一。
What goes on in a cocoon as a caterpillar changes into a butterfly remains one of nature's best kept secrets.
毛毛虫变成蝴蝶，经过了千辛万苦的蜕变，如果它一旦放弃，那将功亏一篑。
Caterpillar becomes a butterfly, after a lot of hard work of transformation, if it once abandoned, it would fall short.
毛毛虫最终将蜕变成一只蝴蝶。
The caterpillar will eventually metamorphose into a butterfly.
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