buzzer

1.Press the buzzer when you want to talk.

话的候就按蜂鸣器。

2.We pressed the buzzer in our cabin and a steward arrived instantly.

我们按了客舱的呼叫器, 一个乘务马上来了。

3.The buzzer went off at eight o’clock.

蜂鸣器在8点钟响了。