retractedadj.可伸缩的动词retract的过去式和过去分词.retractv.缩回；收回；撤销retractable launching box收放式发射器retractable overhead bins收放式头顶行李架retraction of mediastinum纵隔退缩retractor dorsalis muscle背鳍缩肌(动)retraction ring of uterus子宫收缩环retractable undercarriage伸缩起落架retractable finger pickup伸缩指式捡拾器retractable landing light收放式着陆灯retractable fender system伸缩式防撞装置retractable wrapper rolls伸缩式助卷机辊