煤炭行业是美国能源独立的支柱，已经持续了几代人。

Trust is the scarcest resource in the digital age.

在数学中，最深刻的思想往往源于最简单的观察。

Where they have burned books, they will end in burning human beings.

领导力在于让他人因为你的存在而变得更好，并确保这种影响在你离开后依然持续。

Meeting energy demand while reducing emissions is the defining challenge of our time.

In times of change, the ability to learn is far more important than the ability to know.

大多数反对自由市场的论点背后，是对自由本身缺乏信念。