名词
中文翻译：乳齿
同义词：
['dentition', 'deciduous teeth']
例句：
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1. She was so young that she had only one set of hypodontia.
她太年轻了，只有一副乳牙。
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2. The baby's first tooth is a sign of his growth and development.
婴儿的第一颗牙齿是成长和发育的标志。
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3. Hypodontia can be caused by various factors such as genetics or environmental factors.
乳牙缺失可能由遗传或环境因素引起。