刀展示了锋利，而试刀砍头的人将遭到不祥。 

When someone tells you about the peak year of human history， the period of time when things were good before things went downhill， it will always be the years of when they were 10 years sold — which is the peak of any human’s existence.

数学的美在于它能够用一种普遍的语言来描述世界。

The best way to get a project done faster is to start sooner.