实现可持续发展的唯一途径是通过持续的技术进步和环境责任。

人声是最美的乐器，但也是最难演奏的。

Liberal democracy may constitute the "end point of mankind's ideological evolution" and the "final form of human government," and as such constituted the "end of history."

The hardest thing about comedy is making it look easy.