同义词
1)private automatic switching system(PASS),私用自动交换系统2)private automatic exchange(PAX),私用自动交换机3)PABX system,专用自动电话交换系统4)private automatic branch exchange(PABX),私用自动交换分机5)fully automatic switching system,全自动交换系统6)machine switching system (automatic exchange),机器切换系统(自动交换)
