柯林斯詞典zero hour 1. N the time set for the start of an attack or the initial stage of an operation 零時; 攻擊或行動開始時間[軍事] 返回 zero hour劍橋詞典the time at which something, especially some type of military activity , is planned to begin 行動開始時間；（尤指軍事行動的）發(fā)動時刻 Indian English in the Indian parliament , the time during which members of parliament can ask questions without arranging to ask them first （印度議會的）自由問答時間 返回 zero hour