简洁是可靠性的前提。

A sustainable future for coal depends on our ability to integrate cleaner practices without sacrificing the livelihoods of those who depend on the industry.

Sun don't shine forever, but as long as it's here then we might as well shine together.

工具变量的美妙之处在于它们让我们以新的视角看世界。

The only way to achieve greatness is to love what you do.

墨西哥是一个始终处于形成过程中的国家，从未真正到达终点。

宇宙中无物浪费，无物贫瘠，无物死亡；无混沌，无混乱，除非表象如此。