自从我们小时候在这个公园玩耍以来,已经过去很多年了。

It's been many years since we played in this park as children.

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It's been many years since we played in this park as children.

since 在这里是连词,表示"自从...以来",用于引导时间状语从句,说明从过去某个时间点开始持续到现在的情况。

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