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润 滑油油膜 : 35 phrases in 13 subjects |
| Agriculture | 1 |
| Automobiles | 3 |
| Aviation | 1 |
| Compressors | 2 |
| Drilling | 1 |
| Electric machinery | 3 |
| Electronics | 1 |
| Metallurgy | 5 |
| Oil / petroleum | 3 |
| Rail transport | 1 |
| Shipbuilding | 2 |
| Space | 3 |
| Technology | 9 |
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