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联轴齿轮 : 11 phrases in 8 subjects |
| Compressors | 1 |
| Drilling | 1 |
| Metallurgy | 2 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 1 |
| Technology | 3 |
| Wind Energy | 1 |
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