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lower jaw [noun]
lower jaw 直接修饰名词，构成复合名词。
He suffered a lower jaw fracture.
他患有下颌骨折。
下颚；下颌
先理解核心含义，再看它在真实句子里的用法。
下颚；下颌
The part of the face below the mouth; the jaw.
He suffered a lower jaw fracture.
他患有下颌骨折。
嘴部以下的面部；下颌。
The part of the face below the mouth; the jaw.
下颌骨；与颅骨共同构成头骨的骨头。
Specifically, the bone therein; the mandible of humans and other vertebrates that, with the cranium, composes the skull.
The boxer suffered a fracture to his lower jaw during the match.
这名拳击手在比赛中下颌骨折了。
You should relax your lower jaw when you speak to avoid tension.
说话时你应该放松下颌以避免紧张。
The dentist examined her lower jaw and found no cavities.
牙医检查了她的下颌，没有发现蛀牙。
lower jaw 直接修饰名词，构成复合名词。
He suffered a lower jaw fracture.
他患有下颌骨折。
表示所属关系，后接of短语。
The lower jaw of a human is called the mandible.
人类的下颌被称为下颌骨。
形容词修饰，通常前加不定冠词。
He has a strong lower jaw.
他有强壮的下颌。
Not this
He broke his under jaw.
Use this
He broke his lower jaw.
Under jaw 是直接翻译中文“下颌”的误用，英语中固定说法是 lower jaw。
Not this
He has two lower jaws.
Use this
He has a lower jaw.
Lower jaw 指的是下颌骨这一整体结构，通常为单数，不能按可数名词加复数。
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页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.