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。
Once we dreamt that we were strangers。 We wake up to find that we were dear to each other。
The pursuit of happiness is not selfish—it’s essential for a meaningful life.
人生太短暂,不能活在别人的梦想里。