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| geologic age; geological age | |||
| 地质 期: 30 phrases in 8 subjects |
| Agriculture | 2 |
| Desert science | 2 |
| Earth sciences | 2 |
| Engineering geology | 2 |
| General | 1 |
| Geology | 1 |
| Oil / petroleum | 6 |
| Technology | 14 |
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