The other two you know are stuff you can add, and you know where you're adding those things, because the particle has a head start.

另外两项是可加可不加的,而且你也知道这两项是怎么来的,因为质点运动是有起点的

耶鲁公开课 - 基础物理课程节选

OK. So we should be able to figure this out for any orbital that we're discussing, and when we can figure out especially radial nodes, we have a good head start on going ahead and thinking about drawing radial probability distributions.

我们可以将这种方法,用于任何轨道，当我们可以算出有多少个径向节点的时候，我们就为画出径向概率分布,开了个好头。

麻省理工公开课 - 化学原理课程节选