The oldest, shortest words—'yes' and 'no'—are those which require the most thought.
Science is not just about discovering new things, but also about improving the quality of life for people around the world.
有用是这些老人曾经对自己最好的希望,而无目的是他们最深的恐惧。
【译文】不要笑话别人很老,自己有一天也会变老。同邻里相处好,就像捡到一块宝贝一样可贵。只要安分守己做人,一生都不会有烦恼。