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Employees were taught to mirror a guest's volume and rhythm of speech to put him at ease, Moser says.

他说，员工被教导根据顾客讲话的音量和节奏来反应，这样可以让顾客平静。

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With full control of volume levels handed to the system, the computer could automatically lower the din on one channel and allow the speech to come through as a pleasant relief.

只要将音量水平的控制权交给系统，计算机就可以自动降低一个声道的声音，让语音发出悦耳的声音。

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The app does not record the speaker's words, said Dobson, but rather monitors the acoustic elements of their speech -- such as volume, intensity, pace and pitch -- to take an emotional reading.

CNN: STORY HIGHLIGHTS

It may be that the price of free speech is to turn down the volume for 60 seconds.

ECONOMIST: The downside to the First Amendment