改错 A crocodile has sharp tooth and hard skin.

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改错Acrocodilehassharptoothandhardskin.改错Acrocodilehassharptoothandhardskin.改错Acrocodilehassharptootha

改错 A crocodile has sharp tooth and hard skin.
改错 A crocodile has sharp tooth and hard skin.

改错 A crocodile has sharp tooth and hard skin.
A crocodile has sharp teeth and hard skin.