background noise of tape recorder 录音机背景噪声 ; 录音机背景杂讯
Never mind the audible screams and sounds of struggle in the background - all caught on tape-the operator insists she heard no noise on the line.
背景里可以听到的尖叫声和打斗声都被录下，接线员却全然不顾，坚持说她在电话那头什么声音都没听到。
We couldn't hear what they were saying on the tape—there was too much background noise.
我们听不出磁带上他们说的话——背景嗓音太大了。
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