What Wright gives us here is an account of the two parts of this story that says this is an account of not one childhood, but two.

这部分怀特让我们了解到,他讲的不是一个童年,而是两个。

耶鲁公开课 - 1945年后的美国小说课程节选

First of all, this is the two s orbitals in hydrogen, 1s plus 1s smearing to give us this sigma molecular orbital.

首先，这是氢气中的两个s轨道，1s与1s轨道重叠,产生sigma分子轨道。

麻省理工公开课 - 固态化学导论课程节选