alarm for burnout of a main filament

例句：

1. 1.The fire alarm went off in the kitchen.
   厨房里的火警铃响了。
2. 2.I'll be home by 7 p.m., so don't worry about me.
   我七点前会到家，所以不用担心我。
3. 3. The doctor gave us an alarming diagnosis.
   医生给我们一个令人担忧的诊断。