intercom

音标发音

The intercom buzzed and he pressed down the appropriate switch.
对讲机发出嗡嗡声，他按下了相应的开关。
to announce sth over the intercom
通过内部通话系统宣布
The manager spoke to the employees over the intercom.
经理用内部的通话系统向员工讲话.
to announce sth over the intercom
通过内部通话系统宣布
He pushed a button on the intercom. "Yes?" came a voice.
他按了内部对讲机上的一个按钮。“有什么事吗？”一个声音问道。

a device that people speak into when they want to communicate with someone who is inside a building, in a different room, in part of a plane, etc.

An intercom is a small box with a microphone that is connected to a loudspeaker in another room. You use it to talk to the people in the other room.