The hard shell on a beetle is an outside protection, as is the "skin", called cuticle, of an earthworm.

甲壳虫身上的硬壳是外表保护层，就像蚯蚓的“皮肤”，它叫角质层。

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The hard shell on a beetle is an outside protection, as is the "skin, " called cuticle, of an earthworm.

甲壳虫身上的硬壳是外表保护层，蚯蚓的“皮肤”，叫角质层，也是保护层。

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