Jack finished his task two hours ahead of time.
杰克提前两小时完成了任务。
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。
The race will run over 70 laps, or 306.458 kilometres (190.420 miles). It starts at 1400 hours local time, which is two hours ahead of GMT.
这场比赛将有70圈的比赛，或者说306.458千米（190.420英里）。比赛将在当地时间14：00举行，比格林尼治标准时间早两个小时。
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