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- 普及读物 (5)
- 通俗读物 (5)
- 社会发展史 (4)
- 人类进化 (3)
- 历史 (3)
- civilization (1)
- degeneration (1)
- happiness (1)
- history (1)
- human beings (1)
- human evolution (1)
- language and culture (1)
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- migrations (1)
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- outer space (1)
- psychological aspects (1)
- quality of life (1)
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