This area is off-limits due to high radiation levels.

This radio is emitting music.

There is an old radio cassette in my room.

My grandfather still uses an old transistor radio.

He is operating a radio-controlled helicopter.

Nami is my best friend.

A big wave rushed to the shore.

Our friend from Poland taught us about their country's culture.

A big wave came at the sea.

We should save electricity for energy conservation.