ring surface worm 环面蜗杆
retainer ring for worm gear 涡轮用挡圈
steering worm bearing outer ring 转向蜗杆轴承外环
N-UNCOUNT Ringworm is a skin disease caused by a fungus. It produces itchy, red patches on a person's or animal's skin, especially on their head and between their legs and toes. 癣 [医学]
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