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1. 经评估,他是个疯子。 After examination, we believe he's psycho.
2. 他也是疯子。 He's also crazy.
3. 他一向任劳任怨,骂他也从不还口,他总不是个疯子吧。 He's been working hard and never shouted back. He's not psycho, isn't he?
4. 他是个聋子。 He's deaf.