煤炭的真实成本必须既考虑其即时价值，也考虑其对社区和生态系统的长期影响。

The key to understanding life is to understand the interactions between its components.

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.

Follow your heart, and use it to lead your life. Anything else is secondary.

我不是说唱歌手，我是一个电影明星。

不要因为累了就停下来，完成了再停下来。