, 0 t r S 仅当 1.2.3 速度和速率(Velocity and Speed) 一、速度 （1）平均速度 = r t （2）瞬时速度 描述质点位置变化快慢和运动方向矢量。
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物理中速率和速度的概念,是泾渭分明的。
There is a very big difference in physics between speed and velocity.
在我们最先的解决方法，FPS基于固定的游戏速度，在低速的硬件下会有问题，游戏速度和帧速率都会有丢失。
Our first solution, FPS dependent on Constant game speed, has a problem when running on slow hardware. Both the game speed and the framerate will drop in that case.
因为连接速度决定了你的上传和下载带宽，所以可能是你的上传输率哽住了你的下载速率。
Since connection speed determines both your upload and download bandwidth, it is possible that your upload rate is choking your download rate.
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