译文修改:关于Hearing protection? dongping已经翻译得很好了,再挑点小刺 : Whenever feasible, engineering controls should be applied first. However engineering controls are not always practical or do not effectively reduce noise to acceptable levels . In this case personal hearing protection is needed. acceptable levels,这个level指noise level(噪声级别) personal hearing protection 个人听力防护(指配戴防声耳塞、耳罩或防声帽)。 查看更多5个回答 . 5人已关注