与焊接金属片不同的是，软件工程师靠编写代码将原料有机的结合在一起。
Instead of welding pieces of metal, software engineers join stuff by writing code.
Rails 2.2 发行说明- 一个非常靠谱的基本覆盖Rails2.2新功能的发行说明（简短的代码例子和链接）以及一份推荐使用特性的名单。
Rails 2.2 Release Notes - A very solid set of release notes for 2.2 with basic coverage of the new features (with short code examples and links) as well as a list of deprecated features.
靠异常编程(Coding by exception)：当有特例被发现时才添加新代码去解决。
Coding by exception: Adding new code to handle each special case as it is recognized.
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