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作用段 : 29 phrases in 10 subjects |
| Automobiles | 1 |
| Desert science | 1 |
| International trade | 1 |
| Microsoft | 2 |
| Oil / petroleum | 1 |
| Polymers | 3 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 10 |
| United Nations | 8 |
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