句中的within months of each other应该如何分析？

句子1：North Korea conducted long-range missile and nuclear weapons tests within months of each other.

句子2：Tony and Shirley remained friends until they died within months of each other in 2013.

这两个句子里的within months of each other应该怎么分析？为什么时间后面能直接接of + 代词，不应该是+事件吗？为什么能说是months of each other ?不应该是within months of each other's tests/death 吗？

希望老师解答，谢谢！

within months of each other.用来表示二个事件之间的时间间隔。

句子1：North Korea conducted long-range missile and nuclear weapons tests within months of each other.

朝鲜在几个月的时间内相继进行了远程导弹和核武器试验。

句子2：Tony and Shirley remained friends until they died within months of each other in 2013.

托尼和雪莉在2013年成为朋友，数月后二人去世。

My father had managed to impregnate the two women in his life within six months of each other. 半年之内，我的父亲让两个女人都怀上了孩子。

曹荣禄 -

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