每一个挑战都是伪装的机会——只要愿意去寻找。
I think the most important thing in life is to be true to yourself.
研究心灵就是研究适应行为;每个思想都是生活的工具。
地球是一个动态的物体,其表面在不断变化。
Good econometrics is like good carpentry—it's all about using the right tool for the job.