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| 净气进口; 背部通气管; 虹吸排气管; 虹吸管的顶背排气管; 风眼; 风巷; 背通气管; 通气管; 背部通气; 背部透气 | |||
| 背衩; 后开衩 | |||
| back vent: 20 phrases in 3 subjects |
| Electronics | 2 |
| Technology | 1 |
| Textile industry | 17 |
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