防萌杜渐

Explanation: DU: block; gradually: refers to the beginning of things; sprout: sprout. In the event of accident or disaster prevention yet. 　　Source: "Han Ding Hong Biography": "If the reform and open government responsible for bow, Du becoming anti-sprouting, then put out the fierce demon, Minato carry harmful than blessing." 　　Examples: Kings of production methods, with the punishment of those who Weaponry to the Imperial Palace, so ~, is also prepared unexpected. ("Old Tang Shuzong on the record")