"background"@en-us . . "background"^^ . "106975796"@en-us . "0"^^ . . "105527894"@en-us . . . "107430480"^^ . . . . . . . "extraneous signals that can be confused with the phenomenon to be observed or measured; \"they got a bad connection and could hardly hear one another over the background signals\""@en-us . "07430480-n"^^ . . . "0"^^ . . "background signal"@en-us .