名词
中文翻译：下颚
同义词：
['jaw', 'lower jaw', 'chin']
例句：
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1.The underpinnings of the structure are made up of the upper and lower jaws.
结构的支撑部分由上下颌骨组成。
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2.She was so focused on her work that she didn't notice her underpinnings were bleeding.
她太专注于工作了，以至于没有注意到她的下颚在流血。
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3. He had a small underpinnings fracture in his jaw.
他的下巴有一处小骨折。