buzzer [ˈbʌzɚ]

例句:

• We pressed the buzzer in our cabin and a steward arrived instantly.
  我们按了客舱的呼叫器,一个乘务员马上来了.
  
• His entrance was announced by a buzzer connected to the door.
  他刚一进去，与门相连的门铃便嗡嗡作响。
  
• The buzzer suddenly responded in a long blast of sound.
  蜂鸣器突然相应地发出了一声响亮的长鸣。
  
• Mr Flattery said he swung his arms at Buzzer, who fell to the ground.
  来自BBC