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| 碳14测定年代 | |||
| 碳年龄测定法 | |||
| 碳定年 | |||
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carbon dating : 10 phrases in 5 subjects |
| Desert science | 2 |
| Ecology | 1 |
| Engineering geology | 2 |
| Oil / petroleum | 2 |
| Technology | 3 |
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