词典释义：
释义
n.
a thing that holds something in place
护圈；定位器
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a guitar string retainer .吉他弦定位器。
an appliance for keeping a loose tooth or orthodontic prosthesis in place
（固定松动牙齿或矫正牙齿用的）固位体。
a fee paid in advance to someone, especially a barrister, in order to secure or keep their services when required
（尤指预付给律师的）聘用定金。
〈英〉 （在不住期间为保留租房而付的）定金。
a servant or follower of a noble or wealthy person, especially one that has worked for a person or family for a long time
（尤指服务多年的）仆人，随从；跟班。
