We made up the bed in the spare room.

我们在空着没用的屋里搭了张床。

《牛津词典》

I let the spare room.

我把那间空房出租了。

《牛津词典》

Photo above: This is the spare room.

上图：这是备用房间。

youdao

Some adventurous scientists might also try sleeping in the spare room, which is the first piece of private real estate to be blasted into space, Garver said.

NPR: Space Station To Get $18 Million Balloon-Like Room

"It's bringing people together - some of whom are prepared to trade down so that they don't have the spare room but some of whom are in desperate need and you're not even hearing the voice of those people in this debate, " he said.

BBC: Welfare system reforms are fair, says Iain Duncan Smith

The government wants to end what it calls the "spare room subsidy" for social tenants, but critics have dubbed the move a "bedroom tax".

BBC: Brick up spare rooms, urges Labour MP Frank Field