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机械 轴 : 18 phrases in 10 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| General | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 9 |
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