I always believe that as long as you persist, nothing is impossible.

城市是一个活生生的东西，总是在变化，又总是一样。

The world is full of people who will tell you what you can't do. What you must do is find the ones who will tell you what you can.

数学的语言是宇宙的语言，通过学习它，我们可以理解宇宙。