n.蜂音器；翁翁作声的东西；信号手；门铃；汽笛
I pressed the buzzer to his house and waited. 我按了他家的门铃,然後等著。
The buzzer sounds.We reluctantly make our way to the shopfloor. 汽笛响了，我们不情愿地向着车间走去。
指示器
