middle ear
US /ˈmɪd.əl ɪər/
UK /ˈmɪd.əl ɪər/

1.
中耳
the air-filled central cavity of the ear, behind the eardrum.
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Infection of the middle ear is common in children.
中耳炎は子供によく見られます。
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The ossicles are tiny bones located in the middle ear.
耳小骨は中耳にある小さな骨です。