Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
评判一个人不是看他的回答,而是看他的问题。
The choice is simple: either we protect nature now, or we pay the price later.
学校是用来培养人才的,但古代圣王的用意不仅如此,还希望治理天下的方法都出自学校