Sustainability isn't a choice; it's our responsibility to the planet and future generations.
数学的语言是普遍的,正是通过这种语言,我们才能传达宇宙最深刻的真理。
Happiness in this world, when it comes, comes incidentally. Make it the objet of pursuit, and it leads us a wild-goose chase, and is never attained. Follow some other object, and very possibly we may find that we have cought happiness without dreaming of it.