我最喜欢的生活中的事情不花钱。很明显,我们所有人最宝贵的资源是时间。
My favorite things in life don’t cost any money.It’s really clear that the most precious resource we all have is time.
The capacity to be alone is the capacity to love. It may look paradoxical to you, but it's not.
The definition of a good mathematical problem is the mathematics it generates rather than the problem itself.