alarm的形容词使人害怕的

　　An alarm bell went off.

　　警钟响了。

　　Do you know how to deactivate the alarm?

　　你知道如何让闹钟不响吗？

　　They fitted a smoke alarm to the ceiling.

　　他们把烟雾报警器安装在天花板上。

　　I forgot to set my alarm and I overslept.

　　我忘了上闹钟，所以睡过了头。

　　The burglar alarm is activated by movement.

　　这防盗警报器一动就会响。