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I think that it's important to have a sense of humor in life. It helps you get through the tough times.

The only limit to our realization of tomorrow is our doubts of today.

我不會讓世界改變我的心。

The harder you work, the luckier you get.

對人類行為的經(jīng)濟學方法并非其他方法的替代品，而是一種補充。

可持續(xù)發(fā)展已不再是一種選擇，而是我們對后代的責任。