我相信爱情，但我也相信保护自己。

数学之美在于它能够将复杂的事物简化。

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."

Consumer preferences evolve rapidly, and staying ahead means listening more than we speak.

创新是解决今天和明天挑战的关键。