短语词组短语eccentricity gearwheel 偏心齿轮gearwheel I 齿轮micro gearwheel 微型齿轮rail gearwheel 扶柄牙轮spur -gearwheel 正齿齿轮gearwheel rubber shaft 大齿轮胶轴retainer ring for big gearwheel 大齿轮用挡圈straight key for big gearwheel 大齿轮用平键 返回 gearwheel