retainern.保持者;仆人;定位器[牙科]牙架.n.(律师、顾问等的)聘金
retainer spring压紧弹簧
retainer flange固定凸缘,挡住凸缘
retainer clause保有条款
retainer pliers挡圈钳
retainer bushing护圈衬套
retainer with balls球护圈
retainer oil seal groove挡油环油槽
retainer production packer承托式采油封隔器
retainer neutral polarized relay组合保持继电器