名词
中文翻译：后牙
同义词：
['back teeth', 'posterior teeth']
例句：
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1.She had a toothache and needed to see the dentist.
她牙疼，需要去看牙医。
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2. The dentist advised her to have her back teeth extracted.
牙医建议她拔除后牙。
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3. He was so embarrassed that he couldn't even look at his back teeth in public.
他如此尴尬以至于在公众场合都不敢看自己的后牙。