最痛苦的并非痛苦本身,而是孤独地承受痛苦。
数学是一门活生生的学科,随着新的思想和发现不断演变。
The mind is a dynamic system that constantly adapts to its environment.
生命中最美的事物是免费的。
Freedom is a condition of mind,and the best way to secure it is to breed it.