通风井 ventilation shaft ; [建] [矿业] air shaft ; vent shaft ; [矿业] shaft

圆形通风井 circular ventilation shaft

释压通风井 Relief Ventilation Shaft

事故通风井 emergency ventilation shaft

房基通风井 Dry Area

自然通风井 air shaft

隧道通风井 tunnel ventilation shaft

通风井太平梯 ventilation shaft emergency stairs

通风井道 ventilation shaft

矿井通风 [矿业] mine ventilation ; ventilation of mines ; underground mine ventilation