1.Now spin is normally discussed in terms of a dimensionless parameter

黑洞自旋在物界中一般用一个位的参数来计量。

2.This dependence is captured in a dimensionless number known as the Drag Coefficient.

这种依赖性以力系数的无量纲数来体现。机翻

3.Then you have “The Big Crunch”, which is space collapsing into a dimensionless singularity.

然后就是“大收缩” ，即空间坍缩成一个无量纲的奇点。机翻