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单词 white alert
释义

WordReference Random House Unabridged Dictionary of American English © 2024
white alert, 
    1. Military(in military or civilian defense) an all-clear signal, directive, etc., indicating that the danger of air raid no longer exists.
    2. Militarya return to normal conditions following an attack or a threat of attack. Cf. blue alert, red alert, yellow alert. 

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