buzzer

n. 翁翁作声的东西,蜂音器,信号手

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

The buzzer rang when the meal was ready.

饭做好时蜂呜器发出　兹　兹的响声.