背景与目的耳鸣是在无外界相应声源刺激时耳内有响声的一种主观感觉，发病率极高。
Background and purposes: Tinnitus is an auditory phantom sensation experienced when no external sound is present.
背景与目的耳鸣是在无外界相应声源刺激时耳内有响声的一种主观感觉，发病率极高。
Background and purposes: Tinnitus is an auditory phantom sensation experienced when no external sound is present.
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