Mathematics knows no races or geographic boundaries; for mathematics, the cultural world is one country.

Disobedience, in the eyes of any one who has read history, is man's original virtue. It is through disobedience that progress has been made, through disobedience and through rebellion.

儿童应该得到成人的爱，而不是成人忙于生活所残余的爱。

我只是想让大家开心。

真实生活就通常就是我们无法掌控的生活。

林业的未来属于那些将树木视为生命系统而不仅仅是立木库存的人。