Because there are two points where the moon’s orbit crosses the sun’s plane, called nodes.

因为月球轨道与太阳平面的交有两，称为交。

No other choice of two intersection points is guaranteed to get all the robo-ants within five minutes.

没有其他选择的两个交可以五分钟内得到所有的机器蚂蚁。

Now that we have a set of intersection  points on separate planes, we find whether the point is inside each corresponding triangle.

现有了一组位于不同平面上的交，会找到该是否位于每个相应的三角形内。

So far we have established the preliminary conclusion that the volume of employment is determined by the point of intersection of the aggregate supply function with the aggregate demand function.

至此，初步建立了就业量由总供给函数与总需求函数的交决定的结论。

This light is called indirect illumination, and in order to calculate it, we take the  intersection point from the primary ray and generate a secondary ray that bounces off it.

这种光被称为间接照明，为了计算它， 取主射线的交并生成从该反射的次级射线。