cusp cap,polar cap是什么意思

用法例句

The relation between emission beam width (ρ) and period (P) of pulsars is studied via the relation of K-P.

从极冠模型出发，利用观测参数Ｋ和辐射锥角的关系，通过研究Ｋ－Ｐ关系导出了对确定辐射区参数有重要意义的辐射束宽和周期的关系。