在网上看到这篇文章觉得写的很不错，但是貌似没有人翻译成中文，我就大胆翻译

了。本人做软件开发6年了，但是大多数是在Windows平台上，最近才在我的机器上装

了一个leopard，在Objective－C上也是一个新手，对于本文翻译的是否到位心里还

在打鼓-See the article online that was very good, but looks like no one translated into Chinese, I boldly translated. I do software development 6 years, but most of them in the Windows platform, only recently in my machine to fit a leopard, in the Objective-C is also a novice, whether or not the translation for this article was still in place, Ta