生活是一份礼物,它赋予我们特权、机会和责任,通过变得更多来回报一些东西。
Liberty means responsibility. That is why most men dread it.
What is love except another name for the use of positive reinforcement? Or vice versa.
数学的力量在于它的抽象性,使我们能够看到不立即显现的模式和联系。