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机械排气
| 通风系统
| 机械排气 | |
| tech. | mechanical exhaust; mechanical sweeping |
| 通风系统 | |
| met. | system of ventilation; ventilation system |
| space | venting system |
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| mechanical exhaust; mechanical sweeping | |||
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机械排气 : 4 phrases in 1 subject |
| Technology | 4 |
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