那到底为什么它们没有划伤呢？
我个人发现这几乎没有用此外它在手机背面提供了一个抬高的区域以防止你在放下手机时把手机划伤。
Personally I found this of virtually no use other than it providing a raised area at the back of the phone which helps stop you scratching the handset when you put it down.
外观无破损（RF天线部位开孔除外），后壳没有明显划伤和破损；
Appearance without damage (with the exception of RF antenna position openings), and after the shell without obvious scratch and damage;
第三、切面特别光滑，没有毛刺的产生，切口是很精细的，对工件没有任何伤害，因为它是不接触材质的，不会划伤切割的物体。
Third, the plane is particularly smooth, no burr, the incision is very fine, no damage to the workpiece, because it is not contact material, will not scratch the cutting object.
第三、切面特别光滑，没有毛刺的产生，切口是很精细的，对工件没有任何伤害，因为它是不接触材质的，不会划伤切割的物体。
Third, the plane is particularly smooth, no burr, the incision is very fine, no damage to the workpiece, because it is not contact material, will not scratch the cutting object.
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