以下为句子列表：
英文: A colored flare used as a warning signal for trucks and railroad trains.
中文: 信号火一种为卡车或火车作警告信号的有色火焰
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英文: A warning signal alerting the crew that the plane was too close to the ground was set off.
中文: 地面发出了警告信号，警告机组人员飞机离地面太近。
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英文: Experts regarded it as a warning signal of an economic smashup.
中文: 专家们把它看作是一场经济灾难的警告信号。
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英文: If the Yellow Rainstorm Warning Signal is hoisted on or before 7 am on the date of walkathon, please listen to radio for the latest announcement.
中文: 天文台如于活动当天上午7时前悬挂黄色暴雨警告，请留意电台之最新宣布。
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英文: If the hand-held metal detector makes the warning signal sound, the employee checked by the guard needs to take out metal contents and then receive the inspection again.
中文: 4当保安在检查该员工时，手动金属探测仪发出警报声，该员工应主动拿出有关金属器件，并重新接受保安的检查。
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