Sometimes it's also called the internuclear axis.

有时候它也叫核间轴。

youdao

A triple bond, again is going to have one sigma bond on the internuclear axis.

一个三键，同样的也有沿着核间轴sigma键。

youdao

Any time two orbitals come straight on together in that internuclear axis, you're going to have a sigma bond.

任何时候两个轨道，在核间轴上直接到一起，你就能得到sigma键。

youdao

And we can actually better visualize this if we plot how that energy changes as a function of internuclear distance.

而我们就能更清楚地看到这些，如果我们画出,能量随核间距的变化曲线。

麻省理工公开课 - 化学原理课程节选

So even though we see a nodal plane down the center, I just want to really point out that it's only when we have a nodal plane in the internuclear or the bond axis that we're calling that a pi orbital.

虽然在中间有个节面，我想要指出的是,只有节面在核间轴,或者键轴上时,我们才叫它π轨道。

麻省理工公开课 - 化学原理课程节选

If we're talking about a single bond, we're talking about 2 orbitals overlapping in the internuclear axis.

如果我们讨论的是单键，我们讨论的是两个轨道,在核间轴中重叠。

麻省理工公开课 - 化学原理课程节选