A proof is a device for convincing someone else that a mathematical statement is true.
证明是一种用于使他人相信数学陈述为真的工具。
Life is too short to live it twice, but literature gives us the chance to live thousands of times.
我还没有达到我想要的目标，但我已经不在原来的地方了。
"You gotta have fun. Regardless of what you do in life, you gotta have fun doing it."
It is the duty of a student to get everything out of a teacher， and the duty of a teacher to get everything out of a student.