1. permanent ventilation of railway tunnel 
   铁路隧道运营通风
2. ventilation and drainage of exploratory tunnel 
   坑探勘探坑道通风排水
3. ventilation of tunnel and underground works 
   隧道及地下工程通风
4. This would solve the problem of ventilation, for if a train entered this tunnel, it would draw in fresh air behind it. 
   这将解决通风问题，因为如果火车进入此隧道，它将抽进新鲜空气。
5. ventilation with underground air 
   地道风利用

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• 1. 通风道
  ventilated wind tunnel 【航空】通气式风洞...ventilation tunnel 通风道...water-carrying tunnel 输水隧洞
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