portable ram外置式油缸portableadj.轻便的；手提式的；[计]可移植的n.便携的东西Portable Image Display System便携式图像显示系统portable magnetic observatory轻便地磁台portable decoration powertool手持装修机具Portable digital oscilloscope数字示波表portable threshold audiometer便携阈值听力计portable anesthesia apparatus携带式麻醉机Portable Laser Range-Finder轻便激光测距仪portable screening audiometer便携式筛选听力计Portable electroencephalogram手提式脑电图portable electric dental unit轻便牙科电机