短语词组短语worm -wheel shaft 蜗轮轴worm emery wheel 蜗杆砂轮Worm -wheel drive 蜗轮传动involute worm emery wheel 渐开线蜗杆砂轮worm grinding wheel 蜗杆砂轮;蜗杆砂worm and wheel drive 蜗杆蜗轮传动 返回 worm wheel