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》

If an unknown person enters a home, the camera will send the owner a warning that will cause an alarm to sound on the owner's smartphone.

如果一个不知名的人进入家中，摄像头就会向主人发送警告，并在主人的智能手机上响起警报。

youdao

When my mother came into my room, I was just lying in bed and waiting for the alarm to go off.

妈妈走进我的房间时，我正躺在床上等着闹钟响。

youdao

So when the fire alarm bell rang, men near the sound of the fire bell dropped what they were doing and rushed out to fight the fire.

VOA: special.2009.05.17

You said, you didn't call us up when we weren't paying any dividend and now we're still paying more than we used to, why all this alarm?

过去不分红的时候,你们什么都没说,而现在我们的分红比过去还多,你们紧张什么

耶鲁公开课 - 金融市场课程节选

I must have forgotten to set my alarm.

我肯定是忘记设闹钟了。

Must 实战 - SpeakingMax英语口语达人

Why aren't bond investors reacting with more alarm to the process of money creation?

ECONOMIST: Buttonwood

When that happens, the brain's built-in alarm to breathe doesn't go off, despite a lack of oxygen.

CNN: Water safety expert: 'Drowning doesn't just happen'

However it goes on Super Tuesday, the two California debates should serve as an alarm to Republicans.

FORBES: L.A. Law