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| 干线皮带运输机; 主传送带; 主小行星带 | |||
| main belt: 16 phrases in 7 subjects |
| Aviation | 4 |
| Metallurgy | 3 |
| Nautical | 1 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 5 |
| United States | 1 |
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