名词 retainer:

1. a fee charged in advance to retain the services of someone

2. a person working in the service of another (especially in the household)

3. a dental appliance that holds teeth (or a prosthesis) in position after orthodontic treatment

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