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地下 层 : 63 phrases in 12 subjects |
| Construction | 1 |
| Drilling | 1 |
| Ecology | 1 |
| Electronics | 8 |
| General | 15 |
| Geology | 16 |
| Oil / petroleum | 5 |
| Oil processing plants | 1 |
| Oilfields | 6 |
| Technology | 6 |
| Water resources | 2 |
| Wood processing | 1 |
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