For Want of a Nail
For want of a nail the shoe was lost.
For want of a shoe the horse was lost.
For want of a horse the rider was lost.
For want of a rider the message was lost.
For want of a message the battle was lost.
For want of a battle the kingdom was lost.
And all for the want of a horseshoe-nail.
-- Benjamin Franklin
只因少了一颗钉
少了釘子，失了蹄鐵。
少了蹄鐵，失了戰馬。
少了戰馬，失了騎士。
少了騎士，失了情報。
少了情報，失了勝仗。
少了勝仗，失了王國。
這全因少了馬蹄鐵釘。
-- 佛萊登
See Also
The Butterfly Effect
In chaos theory, the butterfly effect is the sensitive dependence on initial conditions in which a small change in one state of a deterministic nonlinear system can result in large differences in a later state.
蝴蝶效應
蝴蝶效應 (Butterfly effect) 是指在一個動態系統中，初始條件下微小的變化能帶動整個系統的長期的巨大的連鎖反應，是一種混沌的現象。“蝴蝶效應”在混沌學中也常出現。
The Broken Windows Theory
The broken windows theory is a criminological theory that visible signs of crime, anti-social behavior and civil disorder create an urban environment that encourages further crime and disorder, including serious crimes. The theory thus suggests that policing methods that target minor crimes such as vandalism, public drinking and fare evasion help to create an atmosphere of order and lawfulness, thereby preventing more serious crimes.
破窗效應
破窗效應（英语：Broken windows theory）是犯罪學理論，由詹姆士·威爾遜及喬治·凱林（George L. Kelling）提出，刊載於《The Atlantic Monthly》1982年3月版的一篇題為《Broken Windows》的文章上，論及環境中的不良現象如果被放任存在，就會誘使人們仿效，甚至變本加厲。
Reference
Wikipedia - For Want of a Nail
维基百科 - 只因少了一颗钉
Wikipedia - Broken Windows Theory
维基百科 - 破窗效应
Wikipedia - Butterfly Effect
维基百科 - 蝴蝶效应
That's all! See you.