我不知道如何做任何事情半途而废。
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 individual has always had to struggle to keep from being overwhelmed by the tribe.
I think the best thing you can do is to be grateful for what you have.
腐朽的木头无法雕刻。