Let's draw it in degrees Kelvin, instead of in degrees Celsius.

来重画一下这幅图，现在温度的单位是开尔文。

麻省理工公开课 - 热力学与动力学课程节选

And that's the following. Let's take a particle that is moving in the x-y plane, so that at one instance-- sorry, let me change this graph-- is here--oh, this is bad.

接下来,我们来看一个物体,在 x-y 平面内运动,在这个例子中,对不起,我要重画一下这个图,在这里,这画得不好

耶鲁公开课 - 基础物理课程节选