他们被随机分为四组，并被置于不同等级的背景噪音环境中，从完全寂静到有50分贝、70分贝和85分贝的噪音。
They were randomly divided into four groups and exposed to various noise levels in the background, from total silence to 50 decibels, 70 decibels, and 85 decibels.
在加拿大的研究中，志愿者们边开车边听不同分贝的音乐，从53分贝(相当于办公室的声音环境)到95分贝(相当于石油钻探时的声音环境)不等。
In the Canadian study volunteers carried out tasks while listening to levels of noise varying from 53 decibels (equivalent to an office environment) to 95 decibels (equivalent to an oil rig).
研究人员所定义的听力受损是指听不见25分贝以及25分贝以下的谈话声音，这也是世界卫生组织(WHO)对听力受损的定义。
The researchers defined hearing loss as being unable to hear speech sounds of 25 decibels or less, which is the World Health Organization (WHO) definition for hearing loss.
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