Explanation: Tang Yu literally has the word "mouth", Yao Shun literally has no word "mouth", Shang and Zhou literally have the word "mouth", so the answer is "mouth".

The crossword puzzle is a word game, which is a unique language and cultural phenomenon of Chinese characters. Mainly based on the characteristics of complex strokes, relatively independent radicals and changeable structural combinations, Chinese characters are created in various ways, such as clutch, loss-increasing, pictographic and knowing.

There are broad and narrow definitions of crossword puzzles. A word puzzle in a broad sense refers to all word puzzles, such as word puzzles, word puzzles, sentence puzzles and so on. In a narrow sense, a crossword puzzle refers to a riddle of Chinese characters. The latter pays attention to the combination of writing forms and the collocation of radicals, and describes the components of Chinese characters from the perspectives of form, function and meaning. The expression of words is short, and the rhetorical skills of writing words and riddles are also high.

Extended data

Zhu Zhishan, a writer in Ming Dynasty, was drinking with Tang Bohu and Wen Zhiming. When the table was served, Zhu Zhishan smiled and said, "I'll give you a riddle. If you can't guess, it's his treat today. " Then he casually said a crossword puzzle: "Tang Yuyou, Yao Shunyou; Shang and Zhou dynasties, Tang Wu did not; There are ancient texts, but there are none today. "

Tang Bohu has a quick mind. As soon as Zhu Zhishan's voice fell, he immediately said, "I also want to make your answer a mystery:" The speaker has it, and the viewer has it; Some people jump, but no one walks; There are tall people, no short people. " Wen Zhiming listened, but he was not willing to lag behind. Then Tang Bohu's answer made a crossword puzzle: "There are good people, but there are no wicked people; There are wise men, but no fools; I have it in my mouth, but not in my hand. "

At this time, the hotel owner listened to the excitement of the three of them and came over to have fun and said, "This charade is: there are dumb people, but there are no deaf people; There are lame people, but no pockmarked people; Monks have it, but Taoist priests don't. " Zhu Zhishan, Tang Bohu and Wen Zhiming laughed together.