retainern.保持者;仆人;定位器[牙科]牙架.n.(律师、顾问等的)聘金
retainer ring挡圈
retainer clip绳夹的夹头,绳夹舌板
retainer bolt止动螺钉
retainer disc压绳盘
retainer disk压绳盘
retainer screw护圈螺钉
Retainer slice保持器片
retainer plate护圈板
retainer gland止动密封套
retainer sleeve固定套筒