buzzer excitation

例句：

1. 1.The police officer used a buzzer to alert the fire department.
   警察用蜂鸣器来通知消防部门。
2. 2. The alarm system uses a buzzer to notify people of an emergency.
   警报系统使用蜂鸣器来通知人们紧急情况。
3. 3.The doctor placed a buzzer on the patient's arm to monitor their heart rate.
   医生在病人的手臂上放置了一个蜂鸣器来监测他们的心率。