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| Ordovician | |||
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奥陶 : 53 phrases in 10 subjects |
| Agriculture | 2 |
| Desert science | 4 |
| Drilling | 1 |
| Earth sciences | 8 |
| Engineering geology | 3 |
| General | 2 |
| Geology | 10 |
| Hydroelectric power stations | 6 |
| Oil / petroleum | 1 |
| Technology | 16 |
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