 |
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| 地面排水沟 | |||
| area drainage: 51 phrases in 12 subjects |
| Bridge construction | 2 |
| Desert science | 3 |
| Drilling | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Electronics | 2 |
| Engineering geology | 3 |
| Hydroelectric power stations | 11 |
| Mining | 1 |
| Oil / petroleum | 4 |
| Technology | 20 |
| Water resources | 2 |