The bomber had breached security by hurling his dynamite from a roof overlooking the building.

爆破手从一个俯瞰这幢楼房的屋顶上投掷了炸药,攻破了安全防卫。

《柯林斯英汉双解大词典》

There is also a roof on the bus. It can be used on hot days or rainy days to make kids feel comfortable.

巴士上也有顶，可以在炎热的天气或雨天里使用，让孩子们感到舒适。

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A house with a roof is beautiful.

带屋顶的房子才漂亮。

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But thank God, we have a roof to live under.

VOA: standard.2010.01.02

He said Americans would always build a house but then move before they put a roof on it.

他说,美国人盖房子,总是在还没有盖上屋顶时就搬走了

耶鲁公开课 - 美国内战与重建课程节选

We don't have a roof on our car.

我们的车也没有车顶。

What if 实战 - SpeakingMax英语口语达人

So why are so many brilliant writers struggling to keep a roof over their heads?

FORBES: Why Some People Get All the Job Offers

"I need to live in order to have a roof over my head, " Bosch says.

NPR: Unemployment Rate Doubles For Older Women

When job growth attracts newcomers to an area, those newcomers need a roof over their heads.

FORBES: Not Just Investors: Local Job Growth Also Supporting Home Price Gains