Another way to represent a point in a plane is I've got a radius and I've got an angle from the x-axis, right, and that's a standard thing you might do.

平面上面的点的方法,也就是极坐标,上面那种方法其实是，如果你们喜欢我这么说的话,笛卡尔坐标表示法。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, it's the x-y plane, you can see there's no electron density anywhere there.

它在ｘｙ平面，你们可以看到在这里没有电子密度。

麻省理工公开课 - 化学原理课程节选

Suppose I've got a heat-seeking missile which tracks down the plane.

假设有一个热追踪导弹,正在追踪一架飞机

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Some Arab Sheikh just paid one hundred million pounds for that apartment-- that penthouse apartment-- in that building and the same Sheikh is ordering a Airbus for his-- one of these big Airbus airplanes-- for his personal plane and he's having it plated with gold leaf.

某位阿拉伯的酋长花了一亿英镑,买了那套公寓里的顶层套间,这个酋长还订了架空客,就是那种大型空客,作为私人飞机,还镀上了金叶子

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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

And similarly, actually, if we're looking at our polar coordinates here, what we see is it's any place where theta is equal to is what's going to put up on the x-y plane.

类似的，如果我们,看这里的极坐标系，我们能看到只要在theta等于,多少的地方就是ｘｙ平面。

麻省理工公开课 - 化学原理课程节选

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

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Um-hmm. So, it's going to be the y z nodal plane, or in other words, we can say it's any place where phi is equal to 90 degrees.

嗯，是ｙｚ平面，换句话说，是在phi等于９０度的面。

麻省理工公开课 - 化学原理课程节选

You go back to the same x-y plane; here is some vector A.

回到刚才的 x-y 平面上,这是某个矢量 A

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