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| 通风换气管 | |||
| 排泄管线 | |||
| 排放管线 | |||
| 通风管道 | |||
| 通气管; 通风管路逸气系统 | |||
| 放空管线; 放泄管线; 呼吸管; 排气管线 | |||
| 通风管; 风道 | |||
| 通风系统; 出油路; 排出管线; 排出管路 | |||
| 开衩线; 衩位线 | |||
| vent line: 6 phrases in 3 subjects |
| Automobiles | 2 |
| Aviation | 2 |
| Technology | 2 |
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