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| 公开/私有: | 公开 私有 |
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- united states (41)
- environmental policy (13)
- global warming (9)
- 研究 (9)
- greenhouse effect, atmospheric (8)
- violence (8)
- violent crimes (8)
- crime (7)
- english language (7)
- health risk assessment (7)
- science (6)
- 美国 (6)
- nutrition (5)
- soldiers (5)
- american literature (4)
- child development (4)
- climatic changes (4)
- continental shelf (4)
- drug abuse (4)
- environmental impact analysis (4)
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