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  1. Oxford Dictionary

    H-hour

    • n.
      the time of day at which an attack, landing, or other military operation is scheduled to begin

    • noun: H-hour, plural noun: H-hours

    • 釋義

    名詞

    • 1. the time of day at which an attack, landing, or other military operation is scheduled to begin they assured the Marines that at H-hour the reef would be covered by five feet of water