边缘处的针脚已经开始磨损了。
我们都经历过痛失一条心爱裙子或上衣的时刻，它们有的洗后缩水，有的沿着缝迹开裂，有的在边缘处磨损。
We've all experienced the irritation of a much-loved dress or top shrinking in the wash, coming apart at the seams or fraying at the hem.
在拧卸钻杆时为了保护动力头钻杆接头，防止其磨损，通常的做法是在该接头处联接一个保护接头。
A protecting joint is added at power head rod joint in order to prevent power head rod joint abrasion when rod is screwed or unscrewed.
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