这就类似于一个反馈的过程，一个教室里有很多人，或许你对任何一门科目都不擅长，或是不感兴趣。

It is kind of a feedback loop, which because the classroom has a lot of people, and maybe there is not a subject that you think you are good at or interested at.

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分析了多媒体综合教室的声反馈啸叫问题的成因和常规消除声反馈啸叫的方法。

This article discusses the producing mechanism about sound feedback of loud-speaking system inside room and the methods and skills of restraining it.

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