Coal is one of porous media and during the process of its formation both a great volume of methane and quantity of water generated.
煤是一种多孔介质，在其形成过程中生成了大量的甲烷，并含有大量的水份。
Coal is one of porous media and during the process of its formation both a great volume of methane and quantity of water generated.
煤是一种多孔介质，在其形成过程中生成了大量的甲烷，并含有大量的水份。
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