mike check

剑桥词典

a check to see if a microphone is working correctly, usually by saying something into it
检查话筒，检查麦克风
The sound engineers were up on the stage doing mike checks . 音响工程师在台上检查话筒。
US informal
a way of interrupting a politician or other person who is making a speech , by shouting "mike check " and then saying why you do not agree with what they are saying
“检查话筒”（高声喊出以打断政客或其他人演讲的方式，然后告知自己为什么有异议） 返回 mike check