名詞 buzzer:

1. a push button at an outer door that gives a ringing or buzzing signal when pushed
   同義詞：doorbell, bell
2. a signaling device that makes a buzzing sound

1. Come in when you hear the buzzer.
   你聽到蜂音電鈴聲就進來。
2. Oh, there's the buzzer.
   哦，開演前的預(yù)備鈴響了。
3. The buzzer rang when the meal was ready.
   飯做好時蜂嗚器發(fā)出　茲　茲的響聲。
4. The moving part of an electromagnetic device such as a relay, buzzer, or loudspeaker.
   電樞電磁裝置的移動部分，如繼電器，蜂音器或揚聲器

buzz.er

n.（名詞）
An electric signaling device, such as a doorbell, that makes a buzzing sound.
蜂鳴器：可以發(fā)出嗡嗡聲的一種電子信號裝置，如門鈴