FRUGALITY. Make no expense but to do good to others or yourself; i.e., waste nothing.

数学研究是一次进入未知的旅程，每一次发现都为新的谜题打开了大门。

Understanding the function of the mind is like mapping the stars - the patterns reveal the purpose.

经过不断改善自己的动作，幼儿从独立活动中获得喜悦。