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periostracum
n.
角质层
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abstract:
The periostracum is a thin organic coating or "skin" which is the outermost layer of the shell of many shelled animals, including molluscs and brachiopods. Among mollusks it is primarily seen in snails and clams, i.
网络释义
角质层
1) 角质层 ( Periostracum ):为壳最外一层,黑褐色的薄层,易脱落.
蝉蜕
... 水牛角(Cornu bubali 蝉蜕(Periostracum Cicadae) (3) 蝉蜕(Periostracum C ...
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n. [无脊椎]角质层
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