名词
中文翻译：颚骨
同义词：
['mandible', 'jawbone']
例句：
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1.The ungular part of the skull is where the brain sits.
颅骨的下颚部分是大脑所在的地方。
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2.The ungular teeth are the first set of teeth to erupt in a child's mouth.
下颚牙齿是孩子口中最先萌出的牙齿。
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3. The ungular region is prone to infections due to its proximity to the mouth.
由于靠近嘴巴，下颚区域容易感染。