羣蚁溃堤

Explanation: Yu small risk of catastrophe. Language of the "old Yu Han Fei Zi": "A little knowledge, of an ant hole collapse; hundred feet of room to sudden clearance of the smoke (blaze) burning." Ching Tien-Hua Chen, "History of Chinese Revolution": "Although the Holy Emperor National is small, quasi all cold feet hurt, injury grievances of the reason the country can not have Jesus ants stream down the day? "