数学中的合作是必不可少的;没有人能独自解决所有问题。
人需要困扰,困扰是心理健康的必需之物。
The world is full of people whose notion of a satisfactory future is, in fact, a return to the idealised past.
我不喜欢赌博,但如果有一件事我愿意赌,那就是我自己。
The investor's chief problem - and even his worst enemy - is likely to be himself.