The health experts say many persons develop permanent hearing damage because of increasing levels of noise in the environment.
健康专家们表示许多人由于环境中噪声级数的增加而使听力受到了永久性的伤害。
While physical hearing protection can reduce sound pressure levels, they do not adequately prevent NIHL in very noisy environments.
对听力的物理防护可以降低声压水平，但若噪声过强，这种物理防护并不能完全保证听力不受损害。
For different levels hearing impaired secondary students, question supporting strategy was a good choose;
不同阅读水平的听觉障碍中学生使用问题辅助阅读时效果都比较好；
Methods: 11 subjects abilities to detect near threshold pure tone levels were measured in different noise free from hearing disorder.
方法：测试在不同的噪声水平时听力正常的11名受试者感知听阈附近纯音的能力。
The noise levels of 20 cabins and the hearing ability of 53 crewmen (106 ears)were measured.
对海军某舰的20个部位进行噪声强度测定，并对53名舰员（106耳）进行了听力调查。
People who sleep next to snorers report high levels of fatigue and sleepiness and may even be at higher risk for hearing loss.
与打鼾者同眠的人们表现为相当的疲劳和嗜睡，甚至可能会有更高的听力受损风险。
Another hearing phenomenon that seems to be more noticeable with headphones is a decreasing sensitivity to sound levels over time, as the ears adapt to loud sounds.
另一个在耳机上比较明显的听觉现象是长时间聆听造成的听觉灵敏度下降。因为耳朵会适应大音量的声音；
The American Speech and Hearing Association has estimated that 40 million Americans are affected every day by dangerously high levels of noise.
据美国演讲与听力协会估计，大约有4千万的美国人正在每天糟受着危险的巨大噪音的影响。
The American Speech and Hearing Association has estimated that 40 million Americans are affected every day by dangerously high levels of noise.
据美国演讲与听力协会估计，大约有4千万的美国人正在每天糟受着危险的巨大噪音的影响。
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