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| dual ratio reduction | |||
| 双速减速: 43 phrases in 9 subjects |
| Automobiles | 22 |
| Communications | 2 |
| Construction | 1 |
| Nautical | 2 |
| Oil / petroleum | 2 |
| Rail transport | 3 |
| Space | 1 |
| Technology | 8 |
| Wind Energy | 2 |
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