Using the map data, they found a way to determine the numbers in real time and trigger warnings 30 minutes to two hours ahead of time if unusually large crowds are expected to gather.
利用地图数据，他们发现了一种方法来确定实时数字。而且如果将有大量人群聚集，该算法则会提前30分钟到两小时触发警告。
Using the map data, they found a way to determine the numbers in real time and trigger warnings 30 minutes to two hours ahead of time if unusually large crowds are expected to gather.
利用地图数据，他们发现了一种方法来确定实时数字。而且如果将有大量人群聚集，该算法则会提前30分钟到两小时触发警告。
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