a device that shows when an electric circuit has been operated, e.g. a board with bells or lights to show to which room of a large house the servants are being summoned
| 单词 | annunciator |
| 释义 | annunciatornouna device that shows when an electric circuit has been operated, e.g. a board with bells or lights to show to which room of a large house the servants are being summoned |
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