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 chemical agent alarm便携式毒剂报警器portable software environment可移植软件环境portable emergency spacecraft轻便急救航天器portable refrigeration system便携式制冷系统Portable Conference Telephone便携式会议电话portable rail bending machine轻便弯轨机Portable Toxic Vapor Detector便携式毒气探测仪portable blood-gas analyzer便携式血气分析仪portable impression tonometer手持式压陷眼压计Portable Landing Light System轻便着陆照明系统