In ancient China, there was a story that there was a village on the bank of the Yellow River. In order to prevent the Yellow River from flooding, farmers built a high long embankment. One day, an old farmer happened to find that the nest suddenly increased a lot. The old farmer doubted whether these nests would affect the safety of Long Beach. He is going back to the village to report that he met his son on the way. The old farmer's son said disapprovingly, are you still afraid of a few small ants on a strong long embankment? Pull the old farmer to the fields together. It was stormy that night, and the water of the Yellow River soared. The roaring river began to ooze from the ant nest, then sprayed, and finally burst its banks and people were submerged. Perhaps it is the origin of the idiom "A levee of a thousand miles collapses in an ant nest".

The sentence is from Han Feizi Yu Lao: "A levee of a thousand miles, collapsed in the ant nest; A room 100 feet is burning with sudden smoke. "