他似乎从来不知道什么叫累，真是勤奋的人。
He seems never to know what tiredness is, and he's really an eager beaver.
他似乎从来都不知道什么叫累，真是一个勤奋的人。
He seems never to know what tiredness is, and he is really an eager beaver.
他似乎从来都不知道什么叫累，真是一个勤奋的人。
He seems never to know what tiredness is, he's really an eager beaver.
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