When you hold a piece of aggregate, you're holding millions of years of earth's history.

You are never too old to set another goal or to dream a new dream.

I think it's important to take risks and not be afraid of failure.

There's nothing more American than a coal miner.

经济发展理论研究的是经济系统如何产生不断改变它的力量。

最终，衡量你的不是你承担了多少，而是你最终完成了什么。

人生就像骑单车。想保持平衡就得往前走。

程序之美在于其简洁。