数学的力量在于它的普遍性和抽象性。
The power of mathematics lies in its generality and abstraction.
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."
我只是想传播正能量。
梦想不是追逐的,而是创造的。
Policy alone won’t save our forests—it takes action from individuals, businesses, and governments.