I don't want to be as good as I was, I want to be better than I was.
The decline of trust in institutions is one of the most serious problems facing modern democracies.
电影制作的过程和最终成品一样重要。
物体的加速度与所受的合外力成正比,与物体的质量成反比。加速度的方向与合力的方向相同。