intercom

n.内部通话系统(或设备)

复数：intercoms

牛津词典

noun

内部通话系统（或设备）a system of communication by telephone or radio inside an office, plane, etc.; the device you press or switch on to start using this system

to announce sth over the intercom 通过内部通话系统宣布

They called him on the intercom.他们用内部通话系统呼叫他。