 |
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| 标准差异 | |||
| normalized difference: 13 phrases in 8 subjects |
| Air defense | 1 |
| Desert science | 1 |
| Earth sciences | 4 |
| Ecology | 1 |
| General | 1 |
| Geophysics | 1 |
| Mining | 1 |
| Technology | 3 |
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