main return airway 总回风巷
return airway detail 回风巷道
n return-airway 主回风道
main return-airway 主回风巷
return airway corner 回风隅角
The direction of perpendicular to face advance shows J shape and the influence is bigger near the return airway.
在垂直工作面推进方向上呈“J” 字型，且对回风巷附近气体密度影响较大；
Besides, the thickened pulverized fuel ash slurry is filled along with mining at the implementation goaf of a side-buried pipe of a return airway, and has the effect of favorable leaking stoppage.
另外，增稠粉煤灰通过在回风巷侧埋管实施采空区随采随灌，增稠粉煤灰具有良好的堵漏效果。
If the irritation is severe enough, a sleeping person will arouse, clear the airway, then resume breathing and likely return to sleep.
如果刺激足够剧烈，睡着的人就会醒来并清理气道，恢复呼吸，并很可能再度陷入睡眠中。
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