So it's trigonal because we have these three atoms that are bound to the central atom here, and if you picture it, it's actually shaped like a pyramid.

这里三角形是因为,我们有3个原子核中心原子成键，如果你画它，它就是金字塔形的。

麻省理工公开课 - 化学原理课程节选

So what we'll have here is a trigonal planar case, and you can see that we only have three electrons that are set for bonding, so we'll add three hydrogens, and for b h 3, we'll get a stable structure here.

让电子劲量远离的时候，不用考虑它,这个例子是平面三角形，你可以看到，只有3个电子可以成键。

麻省理工公开课 - 化学原理课程节选

So again, if we think about that shape of that carbon atom, it's going to be trigonal planar, 120° it's going to have bond angles of 120 degrees, because we have this set up of having three hybrid orbitals.

如果我们考虑碳原子的形状，它是平面三角形，键角是，因为我们有这三个杂化轨道。

麻省理工公开课 - 化学原理课程节选

The shape is actually trigonal pyramidal.

它的形状是三角金字塔形。

麻省理工公开课 - 化学原理课程节选

So it's trigonal pyramidal.

所以它是三角形金字塔。

麻省理工公开课 - 化学原理课程节选

So we end up with 3 s p 2 hybrid orbitals, so we can think about what would happen here in terms of bonding, and if we think about how to get our bonds as far away as possible from each other, what we're going to have is the trigonal planer situation.

因为现在sp2轨道有1/3的s特征，2/3的p特征，而不是3/4。,我们最后得到3个sp2杂化轨道，我们可以想象,成键时会发生什么，如果我们考虑。

麻省理工公开课 - 化学原理课程节选