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| 圆 顶 齿: 21 phrases in 8 subjects |
| Automobiles | 7 |
| Aviation | 1 |
| Compressors | 1 |
| Mechanic engineering | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 1 |
| Technology | 7 |
| Wind Energy | 2 |
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