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| trace content | |||
| 微含量: 11 phrases in 8 subjects |
| Animal husbandry | 1 |
| Desert science | 1 |
| Engineering geology | 1 |
| Geology | 1 |
| Oil / petroleum | 1 |
| Polymers | 1 |
| Space | 1 |
| Technology | 4 |
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