In the center of each gallery is a ventilation shaft, bounded by a low railing.
在每一条廊道中心都有一口通风井，外面围着一道矮矮的栏杆。
There was a family of cats on the rooftop there, making their home in the ventilation shaft.
在那儿的屋顶上，住着猫的一家，它们的家安在通风竖井里。
This is the ventilation shaft through which air leaves a mine.
这是煤矿上用来疏通空气的通风井。
Equipped with a ladder into the air shaft, the drainage pipes, duct pressure, fire sprinkler pipe and power cables for safety into the ventilation shaft and exports;
进风立井装备梯子间、排水管、压风管、消防洒水管以及动力电缆等，为进风井兼安全出口；
The importance for the mine to strengthen the maintenance of the air return way and the points needing attention in designing and allocating the ventilation shaft are pointed out.
同时提出生产矿山加强回风道维护的重要性，以及在设计和布置通风井时应注意的问题。
The importance for the mine to strengthen the maintenance of the air return way and the points needing attention in designing and allocating the ventilation shaft are pointed out.
同时提出生产矿山加强回风道维护的重要性，以及在设计和布置通风井时应注意的问题。
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