The only way to learn mathematics is to do mathematics.

Chrome-free isn't enough; we need guilt-free.

I think of other ages that floated upon the stream of life and love and death and are forgotten,and I feel the freedom of passing away.

The success of Pinduoduo lies in finding an underdeveloped market.

对过去的反思是未来的智慧之源。

我们看到的不是事物的本质，而是自己的本质。