今日之语：你能做到的，比想像的更多。
设计模式的本质是，为日常遇到的问题提供解决方案。
Problem-->Solution
Each pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice.
—Christopher Alexander
原文地址：http://lsieun.blog.51cto.com/9210464/1811697
