CH↓4

例句：

1. 1.The farm has a large methane generator that produces electricity.
   农场有一个大型的甲烷发电机，用来发电。
2. 2. Methane is a greenhouse gas that contributes to global warming.
   甲烷是一种温室气体，对全球变暖有贡献。
3. 3. The methane leak from the underground storage tank was discovered by accident.
   地下储罐的甲烷泄漏是意外发现的。