... 三方锥 trigonal pyramid 三方锥 trigonal pyramid? 三方单锥晶类 trigonal pyramidal class ...
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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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