在你的生活中，有几个地方，或者可能只有一个地方，发生了某件事，然后还有其他所有地方。
In your life there are a few places, or maybe only the one place, where something happened, and then there are all the other places.
Mathematics is a language that allows us to describe the indescribable.
定义就是限制。
竹简和丝帛文献的研究为了解中国古代文明打开了一扇新的窗口。