幸福和不幸取决于我们对事物的看法。
Happiness and unhappiness depend upon the opinion we have of things.
Sustainability is not an option; it's a necessity for the future of our planet.
朗兰兹纲领证明了抽象思维在数学中的力量。
在任何领域达到精通的秘诀是永远保持学习的心态。