这是煤矿上用来疏通空气的通风井。

This is the ventilation shaft through which air leaves a mine.

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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。

In the center of each gallery is a ventilation shaft, bounded by a low railing.

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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。

In the center of each gallery is a ventilation shaft, bounded by a low railing.

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