1. 房顶;屋顶
    The roof of a building is the covering on top of it that protects the people and things inside from the weather.

    e.g. ...a small stone cottage with a red slate roof...
           有着红色石板房顶的小石屋
    e.g. A pail stood in one corner of the room to catch the drips where the roof leaked.
           房间的一角放着一个提桶，以接住从屋顶漏下来的水滴。

2. 顶篷;车顶;车篷
    The roof of a car or other vehicle is the top part of it, which protects passengers or goods from the weather.

roof

    e.g. The car rolled onto its roof, trapping him.
           车翻了，把他困在了里面。

3. 口腔顶部;上腭
    The roof of your mouth is the highest part of the inside of your mouth.

roof在线翻译

    e.g. She clicked her tongue against the roof of her mouth.
           她用舌头顶着上腭发出啧啧声。

4. (洞穴、矿井等的)顶部
    The roof of an underground space such as a cave or mine is the highest part of it.

    e.g. The cave roof collapsed.
           洞顶坍塌了。

5. （价格、通货膨胀率等）猛增，飞涨
    If the level of something such as the price of a product or the rate of inflation goes through the roof, it suddenly increases very rapidly indeed.

    e.g. Prices for Korean art have gone through the roof.
           韩国艺术品的价格飞涨。

6. 怒气冲天;大发雷霆;暴跳如雷
    If you hit the roof or go through the roof, you become very angry indeed, and usually show your anger by shouting at someone.

    e.g. Sergeant Long will hit the roof when I tell him you've gone off.
           如果我告诉朗中士你已经走了，他会大发雷霆的。

7. 住处;家
    If you have a roof over your head, you have somewhere to live.

    e.g. I am just thankful that we have a roof over our heads.
           我们有地方住我就很感激了。

8. （在屋内）喧闹，喧嚣，大闹翻天
    If a group of people inside a building raise the roof, they make a very loud noise, for example by singing or shouting.

roof

    e.g. He raised the roof at the conference when he sang his own version of the socialist anthem, The Red Flag.
           他演唱自己改编的社会主义赞歌《红旗颂》时，声音穿透了会场的屋顶。

9. 同在一个屋檐下;在同一栋大楼里
    If a number of things or people are under one roof or under the same roof, they are in the same building.

    e.g. The firms intend to open either together under one roof or alongside each other in shopping malls...
           这些公司想一起开在同一栋大楼里，或者彼此紧挨着开在大型购物中心里。
    e.g. While his relations with his mother were reasonably satisfactory, having her living under the same roof was a totally different matter!
           虽然他和母亲的关系还算不错，但和她住在一起就完全是另外一回事了。

10. 在…的家里
      If something happens under your roof, it happens in your home.

      e.g. Lionel has forbidden her ever to mention that name again under his roof.
             莱昂内尔已经禁止她在他家里再提到这个名字。