a piece of electronic equipment used for listening to radio broadcasts

a car radio 车载收音机

I switched on the radio. 我打开了收音机。

the programmes that you hear when you listen to the radio

I heard a good programme on the radio last night. 昨晚我听到一个很好的广播节目。

I don't listen to radio much. 我不常听收音机。

the system or work of broadcasting sound programmes for the public to listen to

a local radio station 地方广播电台

She's got some kind of job in radio. 她在广播电台找了份工作。

a piece of electronic equipment that can send and receive spoken messages or signals, or the messages or signals that are sent or received

We sent a message over the radio/by radio. 我们用无线电发了一条信息。

The children got radio-controlled toy cars for Christmas. 孩子们在圣诞节得到的礼物是无线电遥控玩具车。

to send a message to someone by radio

We'll have to radio for more supplies. 我们将不得不通过无线电请求提供更多的补给。

They radioed their base for help. 他们用无线电报向大本营求援。