feedback
■ noun
1，information given in response to a product, a person's performance of a task, etc., used as a basis for improvement.
2，the modification or control of a process or system by its results or effects.
3，the return of a fraction of the output of an amplifier, microphone, or other device to the input, causing distortion or a whistling sound.
看第三项，似乎是指声音设备受到影响而导致的一些杂音，啸叫
没有~!feedback
n.[无]回授, 反馈, 反应
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