background signal

同义词：

setting | surroundings | backdrop | experience | training | contextual | practice | related | circumstantial | knowledge | upbringing | circumstances | personal history | family | social class | milieu | environment | habitat | blood | nationality | accompanying | scenery | accompaniment | resource | stem | backcloth | desktop | background knowledge | background signal | scope | screen background | downplay | ground | play down |

反义词：

foreground | forehand |