名词
中文翻译：保留的落叶牙
同义词：
['retained tooth', 'retained deciduous tooth']
例句：
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1. The dentist removed the retained deciduous tooth and replaced it with aporcelain crown.
牙医拔除了保留的乳牙，并用瓷冠替换了它。
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2. The patient's retaineddeciduous tooth was causing significant painin her gums.
患者的保留的乳牙导致她的牙龈非常疼痛。
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3. The childhad a retained deciduous tooth thatneeded to be extracted before the permanent teethcame in.
这个孩子有一颗需要拔掉的保留的乳牙，因为恒牙要长出来了。