busyadj.忙的；繁忙的；热闹的；(电话)占线的vt.使忙于busy hour call忙时呼叫数busy indicator示忙器busy back tone忙回信号声busy afternoon忙碌的下午busy back jack忙音插孔busy hour load忙时负荷busy J-Horner占线测试塞孔, 忙音塞孔busy tone trunk忙音中继线busy hour usage忙时应用busy background杂乱背景