Owing to bad weather, the plane had to change its course.

由于天气恶劣, 飞机不得不更改航线。

youdao

Now, of course, if your motion is not in a plane, then that plane will change.

当然，如果运动不是始终在一个平面上，平面是会改变的。

youdao

And, to say that the motion actually stays in that plane forever means that this guy will not change direction.

那么说运动将永远保持在平面上，这意味着它的方向不会改变。

youdao

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

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