Between two and three and four and so on is not very different.

但二维,三维和四维,以及其它维数间的差别就不那么大了

耶鲁公开课 - 基础物理课程节选

So those are our three types of bonds in ethene.

这就是乙烷里的三种间。

麻省理工公开课 - 化学原理课程节选

A triple bond, again is going to have one sigma bond on the internuclear axis.

一个三键，同样的也有沿着核间轴sigma键。

麻省理工公开课 - 化学原理课程节选