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1·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。《柯林斯英汉双解大词典》

2·You're in a double room.

你住的是双人间。

3·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。

4·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。《柯林斯英汉双解大词典》

5·He reserved a double room.

他预定了一个双人间。

6·M: I'd like a double room.

M：我想要一个双人房间。

7·Can I book a double room?

我可以订一间双人房吗？

8·Would you mind a double room?

如果是双人间您介意吗？

9·We'd like a double room.

我们想要个双人房。

10·A single room or a double room?

要单人间还是双人房间？