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富人的舒适依赖于穷人的大量供应。
The comfort of the rich depends upon an abundant supply of the poor.
In computer science, we often deal with problems that are easy to state but hard to solve.
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。
When you tear out a man's tongue, you are not proving him a liar. You're only telling the world that you fear what he might say.
唯一能让你明智的是你自己的经验。