• 音响信号(声音口哨枪声等)。

    Use audio signals (that is, voice, whistle, and weapons fire).

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  • 用号角口哨发出信号时,大战就可以开始了,在任何位置都行持续分钟几个小时

    The fighting starts when a signal such as an air horn or whistle blows, and can last anywhere from a few minutes to a few hours.

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  • 如果口哨的话,只使用可视信号

    If a whistle is not available, use the visual signal alone.

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  • 看到建筑工人半个街区女性口哨就会发现视觉信号比信息有效

    Watch any construction worker whistling at a passing woman from half a block away, and you can see how visual cues can be more powerful.

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  • 如果可能的话口哨救援人员发出信号

    If possible, use a whistle to signal rescuers.

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  • 如果可能的话口哨救援人员发出信号

    If possible, use a whistle to signal rescuers.

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