Secondly, due to the existence of huge modern buildings, how to reduce the wiring cost and decrease the signal attenuation in analogue audio broadcast system is a troublesome problem.
现代建筑物规模庞大，如何减少布线成本和降低信号衰减已成为模拟音频广播系统中非常棘手的问题；
Secondly, due to the existence of huge modern buildings, how to reduce the wiring cost and decrease the signal attenuation in analogue audio broadcast system is a troublesome problem.
现代建筑物规模庞大，如何减少布线成本和降低信号衰减已成为模拟音频广播系统中非常棘手的问题；
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