Where does the historical idiom "looking at plums to quench thirst" come from? , mainly tells the story about what? What does he mean? I will use it to make sentences.

Looking at plums to quench one's thirst, wàng méI zhǐkī, which originally meant plum acid, makes people salivate at the thought of plum acid to quench their thirst. Metaphorically, after the wish can't be realized, comfort yourself with fantasy.

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During the Southern Dynasties and the Song Dynasty, Liu Yiqing wrote "Tales of the World": "Wei Wu went to war, lost his way, and all the armies were thirsty, so he said,' There is a great Meilin ahead, so spare his son. Sweet and sour can quench thirst. When the foot soldiers smell it, they can get the source with their mouths full of water. Shen Songkuo's Strange Talk about Meng Qian Bitan: "Wu people often call plums' Cao Gong', so they can taste plums to quench their thirst. "

After the incident,

The biography of the reflection of Shu Wei Wu recorded the 19th year of Jian 'an (2 14). In autumn and July, Sun Quan was levied. In winter and 10, citizens will return from Hefei. "Cao Cao crossed Chaohu Lake for the third time to cut Wu. In July, the weather was hot, and he marched through Meishan Village, hanshan county, Anhui. The soldiers are thirsty. Standing on the mountain road, Cao Cao pointed to a place far ahead and said, "The front is the Great Merlin". The soldiers rushed forward. In fact, this mountain has been the middle reaches of such a river for more than ten years, and soon there is enough water. Although the soldiers were cheated, they were still very happy. This is the origin of the well-known idiom "Look at the plum to quench your thirst". " The reflection of Wu Shu Xu Chuanchuan records that Cao Cao arrived at Hengjiang (now Maanshan, across the county quarry) and fought with Wujiang Xu Sheng.

"Reading Historical Records Minutes" Volume 29 records: "Meishan is five miles southeast of the county (Hanshan). There are many plum trees in the mountains. According to legend, Cao Cao marched, pointing out that Meilin stopped the thirst of the sergeant. " Volume 189 of Yu Ding Pian Zi Bian records: "Tong Mingzhi (volume 17), (Meishan) is located in Wuli, southeast of hanshan county, Hezhou, and was changed to Louyin Mountain in the Tang Dynasty, where there are many plum trees. When Cao Cao was a teacher here before, the sergeant was thirsty, and the sergeant was thirsty because he pointed at Merlin on the mountain. " In the Qing Dynasty, Hu's Dou Cun also wrote: "Looking at Mei to quench thirst: Cao Cao marched to Hanshan, and all the sergeants were thirsty. Because he pointed to Merlin on the mountain, his thirst stopped. Volume 5 of Kangxi's Hanshan County Records records: "Five miles southeast of meishan county, Tang Tianbao Zhong (742) was renamed Lou Yinshan. According to legend, Cao Tu Wu Dong dispatch troops went to the river, and the sergeant was thirsty. Cao Cao said there were plum trees in front of the mountain, and scholars said there were many plum trees on the mountain. There is a saying in Wang Anshi's poem "The History of the Great Unity":' The general makes a good plan and looks at the green hills and points to the plum trees'.