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| 变换齿轮箱; 挂轮箱 | |||
| 交换齿轮箱; 变速齿轮箱; 变速器 | |||
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change gear box : 7 phrases in 6 subjects |
| Drilling | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Rail transport | 1 |
| Shipbuilding | 1 |
| Technology | 1 |
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