ventilation

This would solve the problem of ventilation, for if a train entered this tunnel, it would draw in fresh air behind it..这样就可以解决通风的问题，当火车进入隧道的时候，它就会带来一股新鲜的空气了。

ventilation system,通风系统

mine ventilation,矿井通风；矿山通风

natural ventilation,自然通风

mechanical ventilation,机械通风；强制通风

ventilation equipment,通风设备；空调设备

air ventilation,空气通风

ventilation shaft,通风井，通风井道

ventilation rate,通风率；换气次数

ventilation fan,通风设备

forced ventilation,强制通风；机械通风

ventilation quantity,通风量

exhaust ventilation,抽出通风；排气通风

ventilation duct,n. 通风管

heating and ventilation,采暖通风

cross ventilation,对流通风，穿堂风；交叉通风

ventilation installation,通风设备

pulmonary ventilation,肺通气；肺通气量；肺换气