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noise (usu. unpleasant)
interference (e.g. radio); static; noise
gossip; irresponsible criticism
録音に雑音が混じっていて聞き取れない。
There was background noise in the recording.
電話に雑音が入って非常に聞きづらい。
There's static on the phone, making it hard to hear.
電波の雑音が混じって聞き取りにくい。
Static noise is mixed in, making it hard to hear.