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| 地形等高线 | |||
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| 地形轮廓 | |||
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terrain contour : 17 phrases in 7 subjects |
| Air defense | 1 |
| Aviation | 3 |
| Earth sciences | 1 |
| Electronics | 3 |
| General | 1 |
| Space | 6 |
| United Nations | 2 |
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