有敲击式、螺旋钉式、内六方螺钉式三种结构形式供选择；

The stop collars are available in three types: Knock-On Type, Spiral Nail Type and Set Screw Type.

youdao

这种光自身的快照看起来像一个螺丝钉的螺纹，或是一截意大利螺旋粉。

A snapshot of the beam itself would look like the threads of a screw, or a bit of fusilli pasta.

youdao

如在简单的机器上的区段所指出的，一个螺丝钉以一个楔住行动行事而且有圆形圆筒(或者切断了圆锥体)与一螺旋状的在它里面的凹槽。

As indicated in the section on simple machines, a screw ACTS with a wedging action and consists of a circular cylinder (or truncated cone) with a helical groove in it.

youdao