1. 室友：收信人可以是朋友(friend)、同班同学(classmate)、校友(schoolmate)、室友(roommate)等,形式较随意,属于半正式文体. 2008年考研真题(道歉信)属于私人信函.

2. 同屋：他在那里等着是因为他要帮我取钥匙,这个在上文说过的;另一方面,上面没有提到的是,事实上,他是我的同屋(roommate). 所以说我的运气是不错的,外婆说我是七月出生的羊,所以我到任何地方都会很顺利(不用担心口粮).

3. roommate

3. 室友(噪音来源)：traffic 交通(噪音来源) | roommate 室友(噪音来源) | neighbor 邻居(噪音来源)

4. 噪音源：(1)reach the bottom of the barrel 没了 | 18、噪音源:music, airplane, neighbor, traffic, airport, roommate, construction | 反应:turn down, keep the volume down, I'm studying, Play softly/quietly.

1. 室友;合租一套公寓（或一幢房子）的人
    Your roommate is the person you share a rented room, apartment, or house with, for example when you are at university.

roommate

2. 室友;同屋者
    Your roommate is the person you share a rented room with, for example when you are at university.

1. an associate who shares a room with you

    Synonym: roomieroomy