矿井乏风直接排放到大气中，不仅造成了资源的浪费，而且加剧了温室效应。
Direct discharge of coal mine methane into the air not only causes waste of resource, but increases the greenhouse effect.
有些矿井利用大气压力差引起空气自然流动，有些矿井则必须用扇风机把空气压人井内。
In some cases the difference in atmospheric pressure causes the air to circulate naturally; in others a fan must be used to pump air into the mine.
从废弃矿井逸散到大气中的瓦斯是一种温室气体，同时也是一种煤层气资源。
Methane emitted from abandoned coal mines is a kind of greenhouse gas, and it is also a kind of CBM resource.
从废弃矿井逸散到大气中的瓦斯是一种温室气体，同时也是一种煤层气资源。
Methane emitted from abandoned coal mines is a kind of greenhouse gas, and it is also a kind of CBM resource.
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