给出一个平面上的区域，求它的面积。

I give you some region in the plane and you want to know just its area.

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当我们把一个物体，放到引力场中，我们会得到在一个平面上的轨迹。

When we throw up an object in a gravitational field, you have the trajectory in a plane.

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Hayes解决了如何确定一个平面上的三个点是否在一条直线上的问题。

Hayes solves the problem of determining whether three points in a plane are collinear.

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And so it has what? In contrast to the sigma, it has a nodal plane containing both nuclei.

这是什么，和sigma相反，它是包覆在核上的平面电子云，有一个界面。

麻省理工公开课 - 固态化学导论课程节选

So, the wave function at all of these points in this plane is equal to zero, so therefore, also the wave function squared is going to be equal to zero.

因此这里的,波函数平方也等于零，如果我们说在这整个平面上,任何地方找到一个ｐ电子的概率都是零。

麻省理工公开课 - 化学原理课程节选