总结，人们接触有害声音的次数正在不断增长，噪声污染已经对环境造成了伤害。
In conclusion, with people exposed to dangerous sound levels on the rise, noise pollution has become a common occupational and environmental hazard.
噪声是电力行业比较突出、影响较大的职业性有害因素。
The noise hazard is the bigger harmful factor of occupation job grading in Thermal power plant.
然而，最有害的噪声为PLCC应用是在输电线叠加的那。
However, the most harmful noise for PLCC applications is that superimposed on a power line.
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