| 单词 | 保护壳 |
| 释义 | 〔cocoon〕A protective case of silk or similar fibrous material spun by the larvae of moths and other insects that serves as a covering for their pupal stage.茧：纤维或类似纤维材料的保护壳，由蛾或其他昆虫的幼虫做成，作为其蛹阶段的覆盖物 |
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