retracter移锭器,牵开器
retractv.缩回;收回;撤销
retractor for maxilla resection上颌窦切除拉钩
Retract Before Firing Contractor发射前收缩装置承包商
retractable direction finder loop收缩式测向器环形天线
retractor and elevator for phalanx指骨拉钩起子
Retraction maxillary anterior teeth上前牙整体后移技术
retraction of the tympanic membrane彭膜凹陷
retractable nose undercarriage unit收放式前起落架
retractable main undercarriage unit收放式主起落架
retractable shading-of-buildings活动式建筑遮阳设施