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Why is there a joke that Union Medical College Hospital is the most expensive place in Beijing?

One day, when I was not very busy, a buddy asked me to write a wedding invitation for me. After writing for a long time, I feel a little wrong, but even if I look at it, I can't see anything wrong. At this time, my brother's daughter-in-law came to have a look and said, "Can the groom's name be changed? We are impossible. "