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- 研究 (342)
- social aspects (59)
- management (46)
- united states (42)
- history (41)
- technological innovations (41)
- economic aspects (40)
- environmental aspects (39)
- 文集 (35)
- research (33)
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- sustainable development (29)
- data processing (27)
- 研究报告 (27)
- political aspects (26)
- law and legislation (23)
- 通俗读物 (23)
- climatic changes (22)
- methods (22)
- artificial intelligence (21)
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