buzzer

名词 buzzer:

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

1. Come in when you hear the buzzer.
   你听到蜂音电铃声就进来。
2. Oh, there's the buzzer.
   哦，开演前的预备铃响了。
3. The buzzer rang when the meal was ready.
   饭做好时蜂呜器发出　兹　兹的响声。
4. The moving part of an electromagnetic device such as a relay, buzzer, or loudspeaker.
   电枢电磁装置的移动部分，如继电器，蜂音器或扬声器

buzz.er

n.（名词）
An electric signaling device, such as a doorbell, that makes a buzzing sound.
蜂鸣器：可以发出嗡嗡声的一种电子信号装置，如门铃