methane

例句：

1. 1. Methane is a colorless gas that can be found in natural gas.
   甲烷是一种无色气体，存在于天然气中。
2. 2. The production of methane is a major source of greenhouse gases.
   甲烷的生成是温室气体的主要来源。
3. 3. Methane is a potent greenhouse gas that contributes significantly to global warming.
   甲烷是一种强烈的温室气体，对全球变暖有显著贡献。