The return to the input of part of the output of a system or circuit.

【电】反馈；回援(输出的资料有一部分回到输入单位，以便修正或控制)。

Input of an output signal into the microphone, causing noise.

麦克风输出的讯号再度输入而引起杂音。

A reciprocal effect of one person or thing upon another; a reaction or response that modifies, corrects, etc., the behavior of that which produced the reaction or response.

(人或物对他人或物的)反应；反馈。