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放射示踪剂 : 24 phrases in 13 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Desert science | 1 |
| Drilling | 1 |
| Electronics | 2 |
| Engineering geology | 2 |
| Geophysics | 4 |
| Hydroelectric power stations | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 2 |
| Reproductive biology | 1 |
| Space | 1 |
| Technology | 4 |
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