During the gas drainage test in No. 12 Mine of Pingdingshan Coal Mining Group, good gas prevention...

通过在平顶山十二矿的试验，取得了良好的瓦斯防治效果。

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The purposes of winter protection, dust prevention, and pollution of harmful gas prevention are achieved.

从而达到了防寒、防尘、防有害气体污染的目的。

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Coal seams gas content is basic parameter of gas prevention in coal mine, it make a great action of gas discharging quantity.

煤层瓦斯含量是矿井瓦斯防治的一个基础参数，它对矿井瓦斯涌出量的大小起着重要作用。

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According to the Centers for Disease Control and Prevention, anhydrous ammonia is a pungent gas with suffocating fumes that is used as a fertilizer.

CNN: Explosion hits fertilizer plant north of Waco, Texas