名词
中文翻译：第一乳磨牙
同义词：
['first molar', 'primary molar']
例句：
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1.He had a lower first molar extracted last week.
他上周拔除了一颗第一乳磨牙。
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2.The dentist advised him to have his lower first molar checked regularly.
牙医建议他定期检查他的第一乳磨牙。
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3.The patient was having difficulty chewing due to an impacted lower first molar.
患者因为一颗阻生的下第一乳磨牙而咀嚼困难。