I dialed her number, but it was busy. 我撥了她的號碼但卻是忙音。
In communications,a condition that occurs in a network when no circuits are available and a busy tone is returned to the calling part. 在通信技術(shù)中，當無(wú)線(xiàn)路可用因而有忙音返回給主呼叫用戶(hù)時(shí)網(wǎng)絡(luò )的一種狀態(tài)。
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