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词汇 radio alarm
释义

Definition of radio alarm in English:

radio alarm

noun
  • 1A burglar alarm, fire alarm, etc., which transmits a radio signal to a remote location when triggered.

  • 2A facility enabling a radio to be set to switch on automatically at a chosen time; a radio alarm clock.

Origin

1920s; earliest use found in The Atlanta Constitution.

Definition of radio alarm in US English:

radio alarm

noun
  • 1A burglar alarm, fire alarm, etc., which transmits a radio signal to a remote location when triggered.

  • 2A facility enabling a radio to be set to switch on automatically at a chosen time; a radio alarm clock.

Origin

1920s; earliest use found in The Atlanta Constitution.

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