我不是榜样,我是榜样角色。
I'm not a role model. I'm a model role.
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 concept of law involves the union of primary and secondary rules.
解析:通过实践磨练自己。
The concept of truth is inseparable from the concept of freedom.