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- united states (18)
- sociology (14)
- communication (10)
- psychology (9)
- nutrition (8)
- social sciences (7)
- civilization, western (5)
- ethnology (5)
- crime (4)
- mass media (4)
- 美国 (4)
- art (3)
- criminal justice, administration of (3)
- europe (3)
- food (3)
- humanities (3)
- multiculturalism (3)
- public speaking (3)
- 研究 (3)
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