methane lean gas

例句：

1. 1.Methane is anatural gas that is found inunderground reservoirs.
   甲烷是一种存在于地下储层中的天然气。
2. 2. The methaneleaked from the pipeline caused a significantenvironmental impact.
   从管道泄漏的甲烷对环境造成了重大影响。
3. 3. Methane isa greenhouse gas that contributes to globalwarming.
   甲烷是一种温室气体，加剧了全球变暖。