...er2.13.6 实例方法和类方法2.13.7 对象属性（@property）2.13.8 静态属性（static attributes）2.14 类扩展（Class Categories）2.15 Objective-C接口编程2.15.1 接口编程之@protocol2.15.2 接口编程之后台线程2.15.3 接口编程之Notifications2.15.4 接口编程...
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Yet class categories remain surprisingly resilient, which seems to fly in the face of recent economic reality.
然而，对于阶级的划分仍具有很强的适应性，这一点着实让人惊讶，并似乎与具来的经济现实很不相称。
Most people who are doing poorly in a math class fall into three main categories.
大多数数学不好的人可以分为三类。
It discussed the core concepts of creating categories and rule specification in the plugin.xml file, and then described how to write a class to create a basic rule.
本文讨论了在plugin . xml文件中创建种类和规则规范的核心概念，然后描述了如何编写一个类来创建一个基础规则。
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