Pinyin: qi ā n l ǐ zh and dǐ, huǐ yú yǐ xué short spelling: qlzx
Explanation: A small ant hole can break a levee of a thousand miles. It is a metaphor that careless little things will cause great trouble.
A levee of a thousand miles is broken by an ant's nest
Pinyin: qi ā n l ǐ zh and d ǐ, ku ǐ y ǐ xuè
Explanation: dike: dam; Collapse: collapse; Ant hole: the ant hole. A small ant hole can make a long dike burst. It is a metaphor that carelessness in small things will lead to great disaster.
Source: Han Fei's "Han Fei Zi Yu Lao" in the pre-Qin period: "A levee of a thousand feet is broken by an ant hole, and it is broken by an ant hole; A room of 1 feet is burned with smoke from a sudden gap. "