问题描述：
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
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
问题解答：
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