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中耳(粵拼:zung1 ji5;英文:middle ear)嘅主要結構包括耳膜[e 1](下圖 tf 個位)、聽小骨[e 2](人體最細嗰三嚿骨;下圖嘅 h a 同 s)同埋耳咽管[e 3](下圖 ot 個位)等等。聲涉及咗介質粒子(介質粒子通常會係空氣)嘅振動,耳膜一接觸到聲波就會振動,帶動埋聽小骨一齊振,同時耳咽管會一路保持耳內同耳外嘅壓力大致相同。
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