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To encounter someone by chance.
偶然遇到某人
Oh, I didn't tell you that I ran into Mary when I was at the movie theater.
噢，我没告诉你我在电影院碰见玛丽的事
Everyone comes from all over town to this market on the weekend, so you never know who you might run into.
周末，城里各地的人都来到这个市场，所以你永远不知道会遇到谁。