动态代理类给了我们一种以统一方式方便地处理任何方法上的验证途径，同时把所有的验证逻辑完全与核心业务逻辑分离开。

Dynamic proxy classes give us a way to easily handle validation on any method in a uniform way, while completely separating all of the validation logic from the core business logic.

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序列图用于指定子系统边界上的类之间的交互。

Sequence diagrams are used to specify the interactions between classes on the borders of these subsystems.

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首先，PHP解释器在类上查找方法。

First, the PHP interpreter looks for the method on the class.

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It's an example of a very common tool that's going to be really useful to us, not just for doing search, but for doing a whole range of problems. That is, in essence, the template the describes a log style algorithm.

不仅仅是做搜索,还可以解决一整类问题,本质上，这个模板就描述了,对数形的算法,我们一会再回来。

麻省理工公开课 - 计算机科学及编程导论课程节选

PROFESSOR: Last time, Professor Guttag introduced the idea of objects and classes and this wonderful phrase called object-oriented programming.

教授：上节课，Guttag教授,介绍了对象和类的概念以及,面向对象编程这个美妙的短语,这是我今天想继续讲的一个话题。

麻省理工公开课 - 计算机科学及编程导论课程节选

Since we would be traveling to several places on the world, there were several categories that listed the places that were going.

因为我们要去,世界上的几个地方旅行，所以将它们,分成了几类。

麻省理工公开课 - 媒体、教育、市场课程节选