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形密封 圈 : 28 phrases in 10 subjects |
| Automobiles | 14 |
| Aviation | 1 |
| Chemistry | 1 |
| Construction | 1 |
| Drilling | 1 |
| Electric machinery | 1 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Space | 3 |
| Technology | 4 |
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