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1·He's as bald as a coot.

他像一只水鸡一样秃。

2·Why did you buy him a hairbrush?He's as bald as a coot!

你干嘛给他买梳子？他头上光秃秃的，一根头发。

3·Poor man, he is only twenty years old, but owing to illness he is as bald as a coot.

可怜的家伙，他只有20岁，可是由于生病，头顶已经光秃秃了。