Interesting crossword puzzle story

There are good wines to sell. In the Ming Dynasty, there was a couple's inn in the west corner of Shenzhou. Although the age is mellow, the storefront is unremarkable, and the couple are not good at attracting customers with rhetoric. Therefore, business has been very slow. In August of this year, a gifted scholar named Lu Zhaohui took a boat to Shenzhou Mansion to take the imperial examination, and stopped by the couple's shop. In order to relieve fatigue, Lu Zhaohui asked for two or three glasses of wine. After drinking, he repeatedly praised: "The mouth is mellow and sweet, the belly is soft and sweet, and the aftertaste is long. It's really good wine! " Lv Caizi was full of praise. Seeing the shopkeeper frowning and sighing, he was puzzled and asked why. Lu Zhaohui said with a smile: "Boss, don't worry, I have a way to make your business prosperous!" "After that, he asked the hotel owner to fetch Four Treasures of the Study, wrote a poem and posted it at the door of the store-there was a bright moon hanging on the horizon, and a lady and a gifted scholar were tied to Dillian. Bi Bo Chi Pan will meet you at the right time, so it goes without saying that you should read the poem carefully. Alcoholics are mostly literati, and when they pass by, they enter the store to drink. Since then, the business of this couple's shop has been booming. It turns out that these four poems are a riddle in every capital, and when read together, they mean "there are good wines to sell". During the Three Kingdoms period, Cao Cao, a famous politician, writer and strategist, was brilliant all his life. He used the suppression of the yellow turban insurrectionary to strengthen his power and established the state of Wei. One day in October, Cao Cao led his two sons, Cao Pi and Cao Zhi, on a horseback trip to watch the beautiful time in autumn. In the blue sky, swallows and geese fly south in droves. Cao Cao was intoxicated by this scene and wanted to test his two sons' knowledge on the topic of birds. He pondered for a moment and casually made up four sentences: "a pair of migratory birds are flying in the clear sky, the male is thin and the female is fat;" Come once a year and see you cry three times a month. " Xelloss thought for a long time, but could not guess what it was. Cao Zhi, a brilliant and clever man, solved the mystery after careful consideration. Cao Cao was overjoyed. Eight (thin left and fat right; Once a year in August; Three times a month (eight, eighteen, twenty-eight), once every eight days.