单词	eardrum
释义	eardrum /ˈɪədrʌm / noun The membrane of the middle ear, which vibrates in response to sound waves; the tympanic membrane.The ear canal is closed at its inner end by a thin diaphragm of stretched skin known as the eardrum or tympanic membrane, which vibrates as the air pressure changes.... When the eardrum vibrates, tiny bones within the middle ear transmit the sound signals to the inner ear. In some cases, a doctor may suggest inserting a tube through the eardrum to allow the middle ear to drain.
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