double room和twin room都是指双人房.两者的区别在于：double room是指A room for two persons with a double bed (允许两个人住并配有一个双人床的房间)；twin room则是指A room with two beds for two people (允许两个人住并配有两张单人床的房间).通常旅店都会提供这两种方式的双人房,两者价格一样.
