The sound of sirens was an omnipresent background noise in New York.

在纽约，警报声是无处不在的背景噪音。

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For example, a film-maker might opt to include the background sound of an ambulance's siren while the foreground sound and image portrays an arguing couple.

例如，电影制作人可能会选择在背景中加入救护车的警笛声，而在前景的声音和图像中表现一对争吵的夫妇。

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Background sound and chatter does interfere with the system making the retrieval of accurate information difficult.

BBC: NEWS | Technology | Google listens to screen routine

Without that public airing, the NIE could become one more sound in the background noise as the war grinds on, and the electorate looks for anything else to think about.

NPR: U.S. Iraq Policy: Going Down on One NIE?

People using earbuds with lower sound quality attempt to drown out background noise and enhance audio clarity by increasing the volume to dangerous levels.

ENGADGET: Future Sonics debuts Atrio Special Edition professional earphones