单词：silkworm cocoon
silkworm cocoon的用法和样例：
例句
- A cocoon is a kind of silk covering made by an insect.蚕茧是由昆虫制造的一种由丝组成的外包层。
- The conventional cocoon drying methods are also suitable for male cocoons.对于雄蚕茧，常规的烘茧工艺可以达到烘茧的要求。
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