So you should remember that any time we combine 2 s orbitals, what we're going to find is if we constructively interfere those two orbitals, we're going to form a bonding orbital.

你们要记住，任何时候我们组合两个2s轨道，我们会发现,如果我们把它们相长叠加，我们会得到一个成键轨道。

麻省理工公开课 - 化学原理课程节选

x and y can be whatever you like, but I picked a very special example You should go back and remember what we did.

你可以任意选取 x 和 y,但我这里讲个特例,你们应该回忆一下上节课的内容

耶鲁公开课 - 基础物理课程节选