美国学龄儿童中,因环境噪声引起的听觉障碍发生率很高。震耳欲聋的摇滚乐演奏,长时间地使用立体声耳机,以及各种割草机、压缩机、气动泵,汽车等发出的噪声,都会造成内耳听力细胞的逐步退化,导致听觉灵敏度及分辨力下降,甚至造成永久性耳聋。至于因听力障碍而引起的语言交流和学习能力下降,影 Among school-age children in the United States, the incidence of hearing loss due to environmental noise is high. Deafening rock music, prolonged use of stereo headphones, and noise from lawn mowers, compressors, air pumps, cars and the like can cause progressive degeneration of the hearing cells in the inner ear resulting in reduced auditory sensitivity and resolution and even Permanent deafness. As a result of hearing impairment caused by language exchange and learning ability decline, shadow