Well, as a synonym, they often use ambiences.

他们通常用氛围声，跟“无声”差不多。

Ambiences are the unique background sounds that are specific to each location.

氛围声是独特的背景音，具体到每一个地点的背景音。

Ambiences work in a most primal way. They can speak directly to our brain subconsciously.

环境声以最原始的方式起着作用。它们可以在潜意识里直接对我们的大脑说话。