They fitted a smoke alarm to the ceiling.

他们把烟雾报警器安装在天花板上。

《牛津词典》

You should have a smoke alarm outside each bedroom and on each floor of your home.

你应该在每间卧室外和家里的每层楼安装一个烟雾报警器。

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A smoke alarm makes the risk of dying in a house fire smaller.

烟雾报警器可以降低在房屋火灾中死亡的风险。

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They were alerted to the blaze by a smoke alarm.

BBC: Man rescued from blaze

Two recent incidents -- a fire aboard a Japan Airlines aircraft at Boston's Logan International Airport on January 7 and a smoke alarm aboard a plane flying over Japan on January 16 -- prompted the FAA to ground all Dreamliners in the United States, and other nations quickly followed suit.

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Two recent incidents -- a fire aboard the Japan Airlines aircraft in Boston's Logan International Airport on January 7, and a smoke alarm aboard a plane flying over Japan on January 16 -- prompted the Federal Aviation Administration (FAA) to ground all Dreamliners in the United States, and other nations across the globe quickly followed suit.

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