这意味着共有650万青少年经历着听觉损失。
That means about 6.5 million teens experienced hearing loss.
追溯到1994年，每20个年轻人中大约有1人患有某种程度的听觉损失。
Back in 1994, around 1 in every 20 teens had some kind of hearing loss.
如果测试对象听到的是旋律或特殊样本，则在大脑中的听觉中枢是正常的，听力损失的原因肯定位于内耳。
If the subject identifies the sounds as a tune or specific pattern, the central hearing in the brain is normal and the cause of the hearing loss must be located in the inner ear.
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