求翻译：One day, I happened to(碰巧) talk to a stranger on the bus. When he found out that I was from Chicago, he told me that one of his good friends lived there and he wondered if I happened to know him. At first I wanted to say that Chicago was a very big city. He was silent(沉默) for a few minutes, and then he began to tell me all about his friend.是什么意思？

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