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- united states (39)
- congresses (24)
- dictionaries (19)
- history (17)
- english language (13)
- american literature (10)
- diseases (8)
- social aspects (7)
- soldiers (7)
- biography (6)
- biology (6)
- flashman, harry paget (fictitious character) (6)
- methodology (6)
- 教材 (6)
- analysis (5)
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- developing countries (5)
- fiction (5)
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