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1. The dentist used a retainer pin to hold her teeth together.
牙医用一个保持器针来固定她的牙齿。
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2. She needed a retainer pin toalign her teeth.
她需要一根保持器针来调整她的牙齿。
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3. The orthodontist recommended usinga retainer pin to improvethe alignment of her teeth.
正畸医生建议使用保持器针来改善她的牙齿排列。