数学是关于概念之间关系的科学，与这些概念的内容无关。

"We are all the sum of our choices, but also of the choices made for us by others."

能源行业不仅仅是一个行业；它是全球发展的重要组成部分。

You got to put the past behind you before you can move on." And I think that's what my running was all about.

承认你不知道什么是智慧的曙光。