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What is the joke Li Daguo told Xiang Xiu in "Country Love"?

I have a sister, and we have a very good relationship. One day, she called me and he cried. She said that she was pregnant, and her boyfriend didn't answer the phone, crying very sadly. Later, I accompanied her to the hospital to beat the children. The doctor slapped me several times, and later I learned that it was his father ... so wronged, but I didn't explain it.