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。

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A trigonal bipyramid has three equatorial and two axial positions.

一个三角双锥体有三个赤道位和两个轴向位。

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The grey cluster model with fixed weights is introduced, then a new evaluation model based on trigonal whitenization weight function is formulated.

在灰色定权聚类模型的基础上，提出了一种基于三角白化权函数的评估模型。

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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