1. ventilation with underground air 
   地道风利用
2. provided with ventilation or involving pulmonary ventilation. 
   配备通风或涉及肺通风。
3. permanent ventilation of railway tunnel 
   铁路隧道运营通风
4. ventilation for deep open pit 
   深凹露天矿通风
5. The ventilation isn't working. 
   这个通风设备出故障了。

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• 1. 闭路强迫通风
  {vt.}分管分押 enclosed separately ventilation...闭路强迫通风 sent to you separately...{vt.}另函寄上 separately addressed printer
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