The beauty of mathematics is that it is both an art and a science.
数学的美在于它既是艺术又是科学。
要信守承诺。
A moral being is one who is capable of reflecting on his past actions and their motives.
战争即和平。自由即奴役。无知即力量。
可持续采石意味着像倾听股东一样认真地倾听土地的声音。