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检修和维修 : 18 phrases in 10 subjects |
| Automobiles | 1 |
| Aviation | 5 |
| Earth sciences | 1 |
| Economy | 4 |
| Nautical | 1 |
| Navigation | 1 |
| Oil processing plants | 1 |
| Shipbuilding | 1 |
| Space | 2 |
| Technology | 1 |
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