数学的本质在于它的自由。
"The essence of mathematics lies in its freedom."
老年人相信每一件事物;中年人猜疑每一件事物;青年人什么都懂。
You can’t control everything in life, but you can control how you react to it.
我回首前尘往事,犯下重罪的小笨蛋,我想跟他沟通让他明白,但我办不到,那个少年早就不见了,只剩下我垂老之躯。