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例子
During the conference, I ran across a renowned expert in the field of astrophysics.
I ran across an old friend from high school at the mall yesterday.
On my way to the store, I ran across an old neighbor I hadn't seen in years.
During the neighborhood block party, I ran across my childhood friend who had recently moved back to town.
While attending a concert, I ran across a distant relative I hadn't seen in years.
