天地有万古岁月，可人死了就不会再复活；人寿命最多百年，一天很容易就会过去了。

统计方法的目的是为从数据中得出结论提供合理的基础。

The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.

时间总是一个惊喜。你以为你了解它，但其实你并不了解。

创新不仅仅是创造新事物，而是让现有的事物变得更好。