The essence of mathematics lies in its freedom.
数学的本质在于它的自由。
I have such a stressful job that the only way I can get it out of my mind is by running hard；it's the only way I can get some release.
过去是一个异国他乡；他们做事的方式不同。
未来属于那些为之奋斗的人。
No matter who you are, no matter what you did, no matter where you've come from, you can always change, become a better version of yourself.
You must change nothing in your writing without absolute necessity. If it is necessary， then change with simplicity.