基本解释轻便镗床词组短语短语Portable cylinder boring machine 移动式气缸镗床;轻便搪缸机PORTABLE TAPER BORING MACHINE 便携式锥形镗床PORTABLE FINE BORING MACHINE 便携式精密镗床PORTABLE STRAIGHT BORING MACHINE 便携式直镗床portable boring machine detail 轻便镗床专业释义机械工程轻便镗床