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关闭力 : 30 phrases in 9 subjects |
| Automobiles | 7 |
| Chemistry | 1 |
| Compressors | 1 |
| Drilling | 2 |
| General | 1 |
| Hydroelectric power stations | 2 |
| Oil / petroleum | 6 |
| Space | 1 |
| Technology | 9 |
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