短语词组短語back gear shaft 背齒輪軸back axle shaft 後傳動軸back drive shaft bushing 後主動軸襯套back shaft scroll 後軸渦輪back -up shaft 支持輥輥軸JMWNY Back shaft 後軸back shaft station 折返式井底車場back shaft bracket 後尾軸架 返回 back shaft