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| geological period | |||
| 地质 纪: 19 phrases in 8 subjects |
| Bridge construction | 1 |
| Desert science | 1 |
| Earth sciences | 3 |
| Engineering geology | 1 |
| Geology | 3 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Technology | 8 |
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