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英文，介绍Run time的文档，OC实现runtime的机制，和相关类的实现与介绍。

关于Objective-C和Xcode在Mac OS X平台上进行Mac/iPhone/iPad应用开发的书。Apress的水果树系列，封面上是一个切开的西红柿。书是矢量PDF的，内容可拷贝可打印，图

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