I don't think about age. I think about spirit. I think about how I feel inside.
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。
奖励一个人多年来如此愉快地要求玉米植株解决特定问题并观察其反应,可能看起来不公平。