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冰 季 : 28 phrases in 9 subjects |
| Bridge construction | 3 |
| Desert science | 9 |
| Earth sciences | 3 |
| Engineering geology | 1 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 3 |
| Technology | 6 |
| Water resources | 1 |
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