同轴电缆线中心会包含一个铜制金属导线 （Inner Conductor），外面包覆一层塑胶 绝缘保护外皮（Protective Jacket），这层 绝缘外皮通常是由聚氯乙烯（PVC）或是 铁氟龙（Teflon）这两种材质组成。
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The GB/T 12706-2002 adjusts the thickness of armouring steel tape of power cable, and the thickness of corresponding protective jacket changes too, and material usage reduces correspondingly.
GB/T 12706-2002对电力电缆铠装钢带的厚度进行了调整，相应的护套厚度也发生了变化，材料用量相应降低。
Bool jacket: Protective wrap-round to a book, usually made of paper. Also called jacket, Dust jacket.
护封：包卷书本的保护封套。它通常用纸造成。
Fencers must wear protective clothing including a padded jacket, a wiremesh mask and a glove.
击剑运动员必须佩带护具，包括护胸，面罩和手套。
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