If you want to change for a double room, you'll have to pay another $25.

如果你想换一间双人房，你得再付25美元。

Each guest has her own single room, or shares, on request, a double room.

每位客人都有自己的单人房间，经要求也可共用双人间。

A double room with a balcony overlooking the sea had been reserved for him.

一个带一座阳台的海景双人间已被预留给他了。

He reserved a double room.

他预定了一个双人间。

M: I'd like a double room.

M：我想要一个双人房间。