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Grade E word(s):
蚕茧
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蚕茧是由昆虫制造的一种由丝组成的外包层。
A cocoon is a kind of silk covering made by an insect.
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孩子们撕开蚕茧看看里面有没有蛹。
The children tore the cocoon open to see if there was a pupa.
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