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Man's survival, from the time of Adam and Eve until the invention of agriculture, must have been precarious because of his inability to ensure his food supply.
I think the key to a good performance is to be able to listen and react truthfully.
【译文】将知识默记在心,学习时,不感到满足,教人时,不感到倦怠,这三方面我做到了哪些呢?