杂环卡宾金属络合物对许多反应有催化作用，它们是一类有潜在应用价值的催化剂。

N-heterocyclic carbene metal complexes have catalytic activities for many organic reactions, and they are a type of catalyst with potential value.

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So let's take a look at another case where we have s p 2 hybridization, we can actually also have it happen in carbon.

它是B2sp2杂化轨道,和H1s轨道的相互作用，让我们看看另外一个。

麻省理工公开课 - 化学原理课程节选

The reason that it's a sigma bond is sp3 because the s p 3 hybrid orbital is directly interacting with the 1 s orbital of the hydrogen atom, and that's going to happen on the internuclear axis, they're just coming together.

它是sigma键的原因,是因为,杂化轨道直接和氢原子1s轨道相互作用，它们作用发生在核间轴上，它们会到一起。

麻省理工公开课 - 化学原理课程节选