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| 密封圈与球 | |||
| ring and ball: 32 phrases in 9 subjects |
| Architecture | 2 |
| Chemistry | 2 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 3 |
| Plastics | 4 |
| Polymers | 3 |
| Technology | 14 |
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