忧患使人生存发展,安逸享乐使人萎靡死亡。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法的:它是关于理解的。
I raised my kids to be independent—just like me.
I'm not superstitious, but I am a little stitious.