短語詞組短語arm m extension apparatus 上肢牽引器arm m extension bracket 伸縮臂托架arm of extension 引伸桿arm extension bracket 伸縮臂托架standing neckside arm extension 直立頸旁臂屈伸arm extension apparatus 上肢牽引器arm extension test 伸臂試驗back stand pushing arm extension 后撐支架臂屈伸The maximum arm extension length 最大臂伸出長度;臂伸出長度 返回 arm extension