They are then covered in another layer of plasticinsulation.
然后在它们的外面覆盖一层塑料绝缘物质。
2
As you punch it down, the cable descends between the two metal teeth, which remove its plasticinsulation (it's called insulation displacement) and the cable is cut.
当你将电缆穿孔时，电缆在两个金属锯齿中下沉，这样就将电缆的塑料绝缘套剥离。
3
The plastic resin is used in a wide range of products, including electrical wire insulation.