buzzers

1.Press the buzzer when you want to talk.

你想讲话的时候就按鸣器。

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

我们按了客舱的呼叫器, 一个乘务员马上了。

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

鸣器在8点钟时响了。