That electronic is one of several alternatives if the NHTSA decides to require these cars to add sounds. Here's another.

假如NHTSA决定为电动汽车添加声音设备的话，这种电子设备将是备用选择之一；这是另外一种声音。

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Such sounds are included so as to provide an appropriate emotional nuance, and they may also add to the realism of the film.

加入这些声音是为了让情感恰到好处地体现出细微差别，它们也可以增加电影的现实感。

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We also add to the constant assault of sounds through listening to the radio or TV, playing music, and so on.

我们还不断增加声音带来的冲击，如听收音或电视，放音乐等等。

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Once you have your sounds, effects plug-ins let you add audio effects such as auditorium-like reverberation.

CNN: Create your own music on the Mac

The strategy is to use words not to pierce through the fog of voices and sounds in which we all live, but to add to the fog.

FORBES: Fact And Comment

But if you add the wife of pitcher Roger Clemens being dragged into the steroids investigation, sounds like time to check in with BPP's sports analyst Bill Wolff - take out a break from his day and night job on some news network, to channel back to his days as a pro-sports producer TV type.

NPR: Clemens Grilled on Capitol Hill