All right, so I'm burning some energy, I'm burning some fuel to do this somehow, to get that work to happen.

而这个路径需要先加热再冷却，这样，我需要能量来源，比如燃料，来完成做功。

麻省理工公开课 - 热力学与动力学课程节选

And, you've undoubtedly heard a lot in the public press, and even in the political dialogue such as it is these days that hydrogen might be on environmentally friendly fuel.

毫无疑问你已经在公开新闻上，甚至在政治的对话上听到过了,比如最近这些天,氢气是一种环境友好的燃料。

麻省理工公开课 - 固态化学导论课程节选