Know the layout of the room, stand on the podium, test the microphone.

到了现场之后，了解一下场地的布局，在讲台上站一站，测试一下麦克风。

youdao

My test unit also came with an odd little add-on microphone poking out from the bottom, even though it had a built-in mic at the top.

我测试的这台电脑还有一个古怪的外置麦克风，从机器底部伸出来，而其实电脑顶部已经有了一个内置麦克风。

youdao

The electret microphone tester is used to test electret microphone's sensitivity and frequency response.

驻极体传声器测试仪是用来测试传声器的灵敏度及频率响应的。

youdao

Ridley Scott might like to say no one can hear you scream in space, but another application loaded onto the device will put that to the test by playing user-submitted shrieks and recording them with the handset's microphone as they playback.

ENGADGET

Getting a satellite signal out of Perth, for instance, can involve lying prostrate on the ground in the public park next to the CBD with a receiver dish in one hand and a microphone in the other, a bodily feat that requires the kind of physical contortions that might test a Byron Bay yoga instructor.

BBC: Essential reading for new arrivals in Australia