煤能够释放易燃气体这一点早已为人所知。
The ability of coal to release a combustible gas has long been known.
《柯林斯英汉双解大词典》
与水接触释放出有毒的，极易燃气体。
R15/29 Contact with water liberates toxic, highly flammable gas.
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市燃气是一种易燃易爆或有毒的气体。
City gas is a kind of flammable or toxic gases.
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