虚度光阴是第二大的遗憾！这每一天的时间，太宝贵了！并且我们要珍惜每一分每一秒，不让时光白白流逝！

Don’t ask yourself what the world needs. Ask yourself what makes you come alive and then go do that， because what the world needs is people who have come alive.

"The past is a foreign country; they do things differently there."

数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。