这就是分离，从钠核中心开始算。

This is the separation measured from the center of the sodium nucleus.

youdao

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。

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.

youdao

杜坎特还建立并领导了“全国疾病研究交流中心”，核中心设法获得供生命研究用的人体组织。

Ducat also formed and now heads the National disease research Interchange, which procures human tissues for vital research.

youdao

This is the separation measured from the center of the sodium nucleus.

这就是分离,从钠核中心开始算。

麻省理工公开课 - 固态化学导论课程节选