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.
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.
固定的螺丝钉被在压缩和行动强调他们产生被连接的部份之间的一片螺旋状的楔子。
Set screws are stressed in compression and in action they create a helical wedge between the connected parts.
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