Something may have happened to her.这里为什么要用现在完成时

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• 英语翻译On 27 Ferbruary 2008,something unusual happened in Britain; there was a rather large earthquake .It was the biggest U.K earthquake in 25 years.There have been very minor ones in the past but they were not significant compared to this one.只需翻译这句“There have been very minor ones in the past but they were not significant compared to this one.” 前面的“ones”为什么要用复数?
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