That explosion was triggered by an accumulation of gas in an unventilated tunnel.

爆炸是由于瓦斯气体在通风不良的矿井中聚集而产生的。

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In may, he said, miners were dismayed to discover that 59 mules had died from unventilated mine gas.

他说，五月份矿工们很沮丧地发现，有59头骡子在没有通风的矿井里死了。

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Thus it was this time not heaven, but the upper space of an unventilated concert-hall, that sent down snow.

于是，尽管这个大厅并不是露天的建筑，这个密闭的音乐厅里竟然出现了雪花飞舞的奇观。

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The detainees sleep on wooden floors in unventilated dormitories infested with bugs.

CNN: ASIANOW - Asiaweek

As for the dorm, an employee said eight to 10 people live in a room smaller than 220 sq ft, which is cramped and unventilated.

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The buildings were considered pioneers in the "light-court" model of tenement development, intended as an alternative to the dark and unventilated tenements common at the time.

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