他用喇叭筒叫卖, 省劲多了!

He hawks with a megaphone, saving a lot of effort.

VB被连接到喇叭筒的减输入。

VB is connected to the amplifier's minus input.

在喇叭筒反转输入大头针非常重要。

At the amplifier's inverting input pin is very important.

只有当喇叭筒有一个声音的大输入水平的时候，低的开关 （10个分贝）将会刺激。

The low switch (10dB) will activate only when the microphone has a large input level of audio.

装置的内建喇叭筒用来记录并且分析能被听到的任何声音，而且被发现的程度被显示在即时的。

The built-in microphone of the device is used to record and analyze any sound that can be heard, and the detected pitch is displayed in real-time.