孔子说:“三人走路,必有人可作为我的老师。选择他的优点向他学习,借鉴他的缺点进行自我改正。”
数学是一种创造性的努力,就像艺术或音乐一样。
The truth is: the natural world is changing. And we are totally dependent on that world. It provides our food, water and air. It is the most precious thing we have and we need to defend it.