冰冻三尺，非一日之寒

Explanation: Analogy the formation of a situation is the accumulation over time, brewing. 　　Usage: Complex sentence; for subject, predicate; metaphor serious the situation is not temporary but long-term due to 　　Source: Minglan Ling Xiao Xiao Sheng "Golden Lotus" No. 92 back: "Rome was not built, cold day." 　　Examples: ~, The overall situation so bad that not one person, two people's fault. (Gao Yang "rouge Well") Thesaurus:  drops of water wears holes in stone, Tiechu grinding