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- discoveries in geography (4)
- explorers (3)
- north pole (2)
- south pole (2)
- 世界 (2)
- 生平事迹 (2)
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- antarctica (1)
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- historical geography (1)
- manned space flight (1)
- one thousand, a.d (1)
- outer space (1)
- polar regions (1)
- space flight to mars (1)
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