名词
中文翻译：茧
同义词：
['chrysalis', 'chrysalis shell', 'cocoon']
例句：
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1.The caterpillar transforms into a beautiful butterfly by cocooning.
毛毛虫通过茧化成美丽的蝴蝶。
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2.The spider spun a cocoon to protect its eggs during the winter.
蜘蛛在冬天用它的茧来保护它的卵。
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3.The cocoon is a protective covering that allows the caterpillar to grow and develop before it emerges as a butterfly.
茧是一个保护层，允许毛虫在变成蝴蝶之前成长和发育。