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声学上,外耳像管式谐振器一样工作,在3kHz左右具有最强的第一谐振,声音在空气中波长的四分之一(10cm/4 = 2.5cm)与耳道的长度相符。相比之下,在波长大于耳朵大小的较低频率处,灵敏度显著下降。

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