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| level ground | |||
| 水平地面: 25 phrases in 12 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Bridge construction | 2 |
| Desert science | 1 |
| Electronics | 1 |
| Geophysics | 1 |
| Hydroelectric power stations | 1 |
| Mechanic engineering | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Space | 5 |
| Technology | 9 |
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