数学不仅仅是关于数字、方程、计算或算法:它是关于理解的。
我们能留下的最好遗产是一个生生不息的遗产。
心是指南针,但并不总指向北方。
理解问题是解决问题的一半。
The fact is that women have more freedom and opportunity in America today than ever before.
The process of grouping, of organization, is not arbitrary but follows definite laws.