Understanding the computational complexity of learning problems is essential for developing efficient algorithms.

我一次只担心一天的生活。

Kindness is everywhere, all you need to do is look....So , I guess, we just to look, look for the goodness. They are actually....everywhere.

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."