1. The cocoon-to-butterfly theory only works on cocoons and butterflies. 茧变蝴蝶理论只适用于茧和蝴蝶。
2. The paddling pool offers children the feeling of being wrapped in a cocoon. 戏水池给孩子们一种被包在茧里的感觉。
3. These spiders spin large webs in which females suspend a cocoon with hundreds of eggs. 这些蜘蛛结成很大的网，雌性蜘蛛在上面用成百上千的卵悬挂茧。
4. What goes on in a cocoon as a caterpillar changes into a butterfly remains one of nature's best kept secrets. 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。
5. He tucked the coal into the center of the clockwork, and placed it all on the skin, and wrapped it up and tight it into a cocoon shape. 他把煤块塞进钟形装置的中心，并全部放在表壳上，然后紧紧地裹成一个茧状。
