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英语翻译a rule of thumb for estimating the distance in kilometer

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英语翻译
a rule of thumb for estimating the distance in kilometers betwwen an observer and a lightning stroke is to divide the number of seconds in the interval between the flash and the sound by 3.啥意思
英语翻译a rule of thumb for estimating the distance in kilometer
一个估计闪电与观察者之间以公里计的距离的简单实用法则,是把看到闪电和听到雷声之间的秒数除以3.