Methane gas does collect in the mines around here.

周围的矿井里的确有沼气聚积。

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The ignition of methane gas killed eight men.

甲烷起火，致使8人丧生。

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As the waste materials decompose, they produce methane gas.

废物腐烂时会产生沼气。

《牛津高阶英汉双解词典》

Bacteria break down the animal waste to form methane gas.

细菌使动物粪便分解成沼气.

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There is a large amount of methane gas under the Siberian tundra.

西伯利亚的冻土地带之下有大量的甲烷气体.

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And finally, the acids are converted to methane gas.

最后, 有机酸转化为沼气.

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Many of the accidents are caused by the dangerous build - up of flammable methane gas trapped underground.

许多事故都是因井下瓦斯气体的聚集造成的.

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