1、ventilation shaft through which air leaves a mine
煤礦上用來排除空氣的一個坑道。

2、This is the ventilation shaft through which air leaves a mine.
這是煤礦上用來疏通空氣的通風(fēng)井。

3、a ventilation shaft through which air enters a mine
煤礦里能讓空氣流通的一個通道。