... 定位环 steady ring 定位线夹 steady ear 正定位 pull-off mode ...
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In age-related hearing loss (presbycusis), changes in the inner ear that occur as you grow older cause a gradual but steady hearing loss.
对于年龄引起的听觉损耗（老年性耳聋）来说，随着年龄增长，内耳逐渐发生异变从而逐渐引起听觉一点一点下降。
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