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annunciator

noun
/əˈnʌnsieɪtə(r)/
/əˈnʌnsieɪtər/
(physics物理)
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  1. a bell, light or other device that shows which of several electrical circuits is in use信号器:铃,灯或其他设备,显示正在使用的几个电路中的哪个词
    Word Originmid 18th cent.: from late Latin annunciator, from the verb annunciare, variant spelling of annuntiare.

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