This is because it is at the cusp that magnetic field-lines stream down towards the ground, acting as paths for electrons and protons that have slipped past the bow shock.

这是因为磁场线圈是在尖端的地方流向地面的，这些线圈的作用是为那些流失并超越弓形波的电子与质子提供通道。

youdao

In this paper, the device of plasma arc restricted by cusp type magnetic field is designed. The machining experiments of plasma arc restricted ny magnetic field is done.

本文设计出尖状磁场约束等离子弧的装置，进行了磁场约束等离子弧的加工实验。

youdao

Now, 15 years after that first sequencing breakthrough, the field is finally on the cusp of making a real impact, as the cost of sequencing human DNA has gone so low that scientists are likely to sequence hundreds or thousands of genomes over the next couple years.

FORBES: Life Made In The Lab! (But Don't Freak Out)