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| 重力传送辊 | |||
| 重力辊道 | |||
| gravity roller: 17 phrases in 8 subjects |
| Business | 1 |
| Chemistry | 1 |
| Construction | 1 |
| Electronics | 1 |
| Metallurgy | 6 |
| Plastics | 1 |
| Port facilities | 1 |
| Technology | 5 |
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