工作时，丝线在瓷眼表面滑动，为了降低摩擦力，必须提高材料的硬度，光洁度及形状。
Silk thread slides when the job, in China eye outside, for reducing friction, must raise material hardness, smoothness and form.
工作时，丝线在瓷眼表面滑动，为了降低摩擦力，必须提高材料的硬度，光洁度及形状。
Silk thread slides when the job, in China eye outside, for reducing friction, must raise material hardness, smoothness and form.
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