The true measure of a civilization is how it treats its weakest members.
一个文明的真正衡量标准是它如何对待最弱的成员。
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。
Every tree planted today is an investment in a greener tomorrow.