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retainers的英文翻譯是什么意思，詞典釋義與在線(xiàn)翻譯：
英英釋義
名詞 retainer:
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a fee charged in advance to retain the services of someone
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a person working in the service of another (especially in the household)
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a dental appliance that holds teeth (or a prosthesis) in position after orthodontic treatment
