过去从未真正消失;它在我们讲述的故事中继续存在。
The essence of mathematics lies in its freedom.
Happiness is a state of mind, not a set of circumstances.
学习数学的最好方法就是做数学。
I believe that we are all born with a purpose, and mine is to sing.
你孩子吃不上饭是因为我。