annunciator
词源链
- 拉丁语Latin约前 75–公元 3 世纪
书面借入
- 英语English
annunciator
词源说明
From Latin [Term?].
释义
名词noun
- 1Anything that announces something.
- 2A signalling device that shows which of several electrical circuits is active, especially such a device in a telephone switchboard.
- 3UK, railwaysA buzzer in a signal box that sounds when a train activates a treadle positioned on the track, and thus provides a warning or announcement of a nearby train.