这些（噪音）可以是穿透教室建筑结构的室外活动声、教学活动的声音以及室内产生的其它各种声响，这些声音都会因为房间的回声效果而被放大。
These levels come from outside activities that penetrate the classroom structure, from teaching activities, and other noise generated inside, which can be exacerbated by room reverberation.
录音室外的人不大可能听到调制磁带时的噪音，这种噪音是那些很快就过了时的模拟式录音机所特有的，并且这些噪音常常被磁带内容所掩盖。
You're unlikely to notice tape modulation noise outside of a recording studio because it's specific to analog tape recorders, which are fast becoming obsolete, and usually hidden by the music itself.
教室外面的交通噪音可能会分散学生们的注意力。
The noise of traffic outside the classroom may distract the students' focus of attention.
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