intercom

音标发音

The intercom buzzed and he pressed down the appropriate switch.
對講機發出嗡嗡聲，他按下了相應的開關。
to announce sth over the intercom
通過內部通話系統宣佈
The manager spoke to the employees over the intercom.
經理用內部的通話系統曏員工講話.
to announce sth over the intercom
通過內部通話系統宣佈
He pushed a button on the intercom. "Yes?" came a voice.
他按了內部對講機上的一個按鈕。“有什麽事嗎？”一個聲音問道。

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.