经济学中最重要的是理解预期的作用。

安全不仅仅是一项政策，而是我们矿山每天必须践行的一种文化。

The more one forgets himself—by giving himself to a cause to serve or another person to love—the more human he is.

The arc of the moral universe is long， but it bends toward justice.

质量在第一刀落下前就已开始，它始于正确的心态。