Every ton of coal we extract carries a responsibility—to our workers, communities, and the planet.

发散级数是魔鬼的发明，基于它们的任何证明都是一种耻辱。

Quality is never an accident; it is always the result of intelligent effort.

Innovation is the only way to break through the bottleneck.

You don't pass or fail at being a person, dear.

成功的关键是在生活的各个方面不断成长——精神上、情感上、灵性上，还有身体上。