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分 布幅 : 26 phrases in 12 subjects |
| Agriculture | 2 |
| Air defense | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Business | 1 |
| Earth sciences | 1 |
| Electronics | 6 |
| Geophysics | 4 |
| Oil / petroleum | 1 |
| Soil science | 1 |
| Space | 1 |
| Technology | 6 |
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