我们开采的每一块煤都在为某个家庭点亮灯光。

Treating a person to a meal never fails， and is so easy to do. It’s powerful with old friends and a great way to make new friends.

真相并不总在事实中，有时它隐藏在想象的褶皱里。

Persistence is key in mathematical research; many great results come from looking at the same problem from different angles over and over again.

技术应该在后台为你工作，无缝且无形。