短语词组短語eccentricity gearwheel 偏心齒輪gearwheel I 齒輪micro gearwheel 微型齒輪rail gearwheel 扶柄牙輪spur -gearwheel 正齒齒輪gearwheel rubber shaft 大齒輪膠軸retainer ring for big gearwheel 大齒輪用擋圈straight key for big gearwheel 大齒輪用平鍵 返回 gearwheel