有钱的单身汉总要娶位太太，这是一条举世公认的真理。
To teach mathematics is to inspire the next generation of thinkers and problem solvers.
"We live in a world where walls have ears and the ground has eyes."
Good can exist without evil， whereas evil cannot exist without good.
A man of genius makes no mistakes. His errors are volitional and are the portals of discovery.
质量在第一刀落下前就已开始，它始于正确的心态。
The writer's duty is to tell the truth, even when it is uncomfortable.
