But we can imagine an ideal engine, where none of the exhaust energy is waste heat – where there’s no friction or anything like that.

但我们可以想象一个理想的发动机， 其中没有任何废气能量是废热——没有摩擦或类似的东西。

But we can imagine an ideal engine, where none of the exhaust energy is waste heat – where there's no friction or anything like that.

但我们可以想象一个理想的引擎，其中 废热不是废热——哪里。