When you hold a piece of aggregate, you're holding millions of years of earth's history.
成为你希望在世界上看到的改变。
Success is not final, failure is not fatal: It is the courage to continue that counts.
正因为我是你妈妈说话才最算数，因为我最了解你。
模型的唯一真正检验是其预测未来的能力，而未来总是不确定的。
"The world is full of obvious things which nobody by any chance ever observes."