冬天已经到来,春天还会远吗?
This is the map that shows us where we're going. And this is the map that shows us where we've been. And it's never ever ugly.
竞争均衡解决方案的存在与规范经济学或福利经济学之间的关系也许同样重要。
Mathematics is not a spectator sport. You have to get involved.
Every song has its own life.