自然实验是理解现实世界中因果关系的强大工具。

你知道的越多，你就越意识到你不知道的越多。

这是我的一个秘密，再简单不过的秘密：一个人只有用心去看，才能看到真实。事情的真相只用眼睛是看不见的。

Quality is the lifeline of the enterprise. We always adhere to high standards and strict requirements to ensure that every piece of stone can stand the test of time.

I can never be safe; I always try and go against the grain. As soon as I accomplish one thing, I just set a higher goal. That's how I've gotten to where I am.