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- united states (18)
- nutrition (13)
- environmental policy (12)
- climatic changes (10)
- health risk assessment (10)
- global warming (9)
- greenhouse effect, atmospheric (8)
- violence (8)
- violent crimes (8)
- astrophysics (7)
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- water (7)
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- soldiers (6)
- astronomy (5)
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- child development (4)
主题
- 汉语 (2)
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