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- human ecology (9)
- philosophy (8)
- human beings (7)
- social aspects (7)
- 研究 (7)
- climatic changes (5)
- history (4)
- artificial intelligence (3)
- effect of human beings on (3)
- forecasting (3)
- methodology (3)
- nature (3)
- psychological aspects (3)
- psychology (3)
- 企业管理 (3)
- aging (2)
- anthropology (2)
- civil rights (2)
- economic aspects (2)
- effect of climate on (2)
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