柴油发动机是当今已知效率最高的原动机。

我们必须平衡经济增长与环境保护，以确保更美好的未来。

A play is not a novel, it's a blueprint for an event.

Talkers are usually more articulate than doers, since talk is their specialty.

一个人越是忘记自己——通过投身于一项事业或爱另一个人——他就越是人性化。