As people age, accumulated exposure to noise and other factors may lead to deafness or hearing impairment.
随着年龄的增长，长期接触噪音或其他因素，久而久之就可能导致耳聋或听力障碍。
Objective: To assess the dose response relationship between the prevalence rate of noise deafness and the noise exposure.
目的：探讨五金工业噪声性耳聋患病率与噪声接触剂量之间的关系。
In contrast, even the best treatments do not cure the deafness caused by prolonged exposure to noise.
相比之下，对于长期接触噪音所导致的耳聋来说，即便是给予最佳的治疗也无济于事。
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