To acquire knowledge and to be a cultural man is the self-development of human beings.

学文化知识，做文化人就是向人的本质自我生成。

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The development of relation between man and nature has undergone three stages.

人与自然的关系已经历三个阶段。

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The development of relation between man and nature has undergone three stages.

人与自然的关系已经历三个阶段。

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