因此世界调幅广播业务面临前所未有的挑战。

Consequently, AM radio service is faced with challenge that has never showed up before.

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为什么在隧道中调频广播比调幅广播的信号要好一点？

How come we can hear FM longer in a tunnel than AM?

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调幅是广播无线电节目最古老的方法。

Am is the oldest method of broadcasting radio programs.

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调幅是广播无线电节目最古老的方法。

Am is the oldest method of broadcasting radio programs.

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