Here, in one second, it seems to have gone much further, so it's probably traveling faster.

在这一秒内,它似乎运动了更远的距离,所以这段时间它可能运动得更快

耶鲁公开课 - 基础物理课程节选

For example, here, in one second it went from here to here.

例如,在一秒内它从这儿运动到这儿

耶鲁公开课 - 基础物理课程节选

Particle's moving in a plane.

物体在平面内运动

耶鲁公开课 - 基础物理课程节选

Then, I gave you one other very important example of a particle moving in the x-y plane.

下面我再拿一个重要的例子,质点在 x-y 平面内的运动

耶鲁公开课 - 基础物理课程节选

Our picture now is going to be some particle that's traveling in the x-y plane.

我们现在的情景是在 x-y 平面内,运动的质点

耶鲁公开课 - 基础物理课程节选

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