In the environment with lower noise level, the earplug will decrease its sound insulation factor accordingly to ensure the useful voice can be heard. 在低声级环境中,其隔音量又足够低,可以保证能接收到一些有用的声信号。
The ultimate noise levels are the same. 最终的噪音水平是一样的。
It's all dictated by the level of background noise in their listening environment. 这些设置都取决于他们收听环境中的背景噪音水平。