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层线 图 : 18 phrases in 8 subjects |
| Agriculture | 2 |
| Earth sciences | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 2 |
| Geology | 1 |
| Oil / petroleum | 2 |
| Technology | 8 |
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