Hope is not an emotion, but a choice.
數(shù)學(xué)中真正的挑戰(zhàn)不是解決問題，而是提出正確的問題。
The art of diplomacy is to understand desires of others and to find a way, where they think they get what they want.
【釋義】兄弟姐妹之間如果缺乏信任，那么彼此的感情就不會親密。