Ancient joke: language help

Original: "Emperor Mao will exhibit outside the city. Fortunately, Zhuquemen planned it himself, and only Wang was lucky. Pointing to the door, he asked Pu, "Why doesn't the word" Zhi "be used in Zhuquemen? Patton said, "Language helps. Mao laughed and said, "It's really helpful. 』」

Zhao Kuangyin, the founding emperor of the Song Dynasty, plans to expand his peripheral cities when he becomes emperor. When he came to Suzaku Gate, he looked up and saw the words "Suzaku Gate" written on his forehead. He felt awkward and asked, "Why not write' Suzaku Gate' but' Suzaku Gate'? What's the use of using a word' knowledge'? " Zhao Pu told him, "This is using the word' zhi' as an auxiliary word." Zhao Kuangyin laughed after hearing this and said, "Even these empty words won't help! "