短语词组短语worm -gear-drive 蜗轮蜗杆传动Worm -wheel drive 蜗轮传动cylinder worm -drive 圆柱蜗杆传动Circular cylinder worm -drive 圆弧齿圆柱蜗杆传动involute cylinder worm -drive 渐开线圆柱蜗杆传动worm and worm -gear drive system 蜗轮蜗杆传动系统 返回 worm drive