Because there is no abrasion between the concave and convex, the nut is reusable.
由于凹面与凸面之间没有磨损，螺母可以重复使用。
The sweet is bright and sanitary, no cementation and no abrasion.
糖块光亮卫生、不粘结、不磨损。
The fork which is polished and with no abrasion to the sequin surface feeds the sequin in the optimum position.
送片拨叉设计最佳送片角度，同时进行抛光处理，对金片表面无损伤。
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