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。
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。
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。
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