名词
中文翻译：残根牙
同义词：
['crippled tooth', 'broken tooth']
例句：
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1. The dentist removed the stub tooth and replaced it with a newone.
牙医拔除了残根牙，并换上了一颗新的。
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2. The oldlady had a stub tooth that shecouldn't afford to replace.
那位老太太有一颗残根牙，她买不起来换。
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3. Thestub tooth was painful andrequired several visits to the dentist fortreatment.
那颗残根牙很痛，需要多次去看牙医治疗。