回风井 meaning in English
return air shaft
Examples
- Pregrouting technology at surface ground for ventilation shaft sinking in liuzhuang mine
刘庄煤矿回风井井筒地面预注浆技术 - At a southern indiana coal mine , an accident at an airshaft killed three people
印第安纳州南部煤矿发生一场事故造成回风井内三名工人死亡。