不能以牺牲他人自由为代价来获得持久和平。
I'm not a celebrity, I'm a legend.
学习计量经济学的最佳方法是通过实践——处理真实的数据和真实的问题。
The motor of our ingenuity is the question ‘Does it have to be like this?’, from which arise political reforms, scientific developments, improved relationships, better books.