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| 通风系统 | |||
| 换气系统 | |||
| 排气系统; 通气系统; 通气管系统; 通风管系统; 透气系统 | |||
| vent system: 18 phrases in 7 subjects |
| Architecture | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Electronics | 5 |
| Nautical | 1 |
| Nuclear and fusion power | 1 |
| Technology | 8 |
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