membrane
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→er3mo2 • ěrmó
eardrum
The word 鼓膜 (lit. "drum membrane") also means the same thing and is used interchangeably.
他 的 耳膜 受傷 了。
His eardrum is injured.
我 感覺 耳膜 有 壓力。
I feel pressure on my eardrum.
醫生 說 我 的 耳膜 完全 正常。
The doctor said my eardrum is completely normal.