... 牙岩 tooth rock 牙虫 tooth worms 牙齿虫 tooth worms ...
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Cylindrical worms are usually worked by formed turning tool or milling cutter. It is inefficient. The tooth shape is difficult to control and the quality is not easy insured.
通常圆柱形蜗杆都是用成型车刀或铣刀加工,效率低而且齿形不易控制,质量也不易保证。
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