The best time to plant a tree was twenty years ago. The second best time is now.
种一棵树最好的时间是二十年前,其次是现在。
我们都是破碎的,但正是裂缝中透进了光。
数学不仅仅是关于数字、方程、计算或算法:它是关于理解的。
Comedy is the ultimate revenge against tragedy.