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定心轴 : 25 phrases in 9 subjects |
| Automobiles | 1 |
| Computer numerical control | 1 |
| Electric machinery | 2 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 3 |
| Shipbuilding | 4 |
| Technology | 9 |
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