... 通道忙音 channel busy tone 线路忙音 line busy tone 忙音信号 busy signal ...
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有些人想打电话回去的，但线路总是忙音(这让人认为是故意把线给卡了)，形势瞬息万变的时刻，通信偏偏拖慢了后腿。
Those who did try to return calls found the lines busy (just in case people think I mean deliberately jammed), leading to critical communication lags amid a constantly shifting situation.
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