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The best way to create interest in a subject is to render it worth knowing, which means to make the knowledge usable.
If I had to live my life over again, I would live it as a trader of goods.
解析:吃粗粮,喝清水,弯起胳膊当枕头,这其中也有着乐趣。
指事物之间相互依存、相互制约的关系。