Many years later, he published his other great work, The Descent of Man.
许多年后，他出版了另一部名著《人类的演化》。
To do great work a man must be very idle as well as very industrious.
要从事伟大的工作，一个人必须既非常勤劳又非常空闲。
A man may acquire great knowledge of topics unconnected with his daily work, and yet get hardly any benefit or relief.
一个人可能会获得与其日常工作无关的某些课题的渊博知识，而没有从中得到什么实益或宽慰。
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