Methane, there are certainly some solid bonds there, but breaking those to form CO2 and water, well it's worth it, right, energetically.

酒精中的确含有很强的化学键，但是打断这些化学键然后生成二氧化碳和水，从能量上来看是值得的。

麻省理工公开课 - 热力学与动力学课程节选

You burn methane, and it combines with oxygen to form water, to form CO2.

燃烧酒精，酒精分子和氧气结合形成水和二氧化碳。

麻省理工公开课 - 热力学与动力学课程节选