A man is not idle because he is absorbed in thought. There is a visible labor and there is an invisible labor.
一个人不是因为全神贯注于思考而无所事事。有看得见的劳动，也有看不见的劳动。
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一个人不是因为全神贯注于思考而无所事事。有看得见的劳动，也有看不见的劳动。