总之，该部分讨论了UML和类图、继承、多态性、封装…一些应该在开头为您介绍的东西。

Anyway, this section talks about UML and class diagrams, inheritance, polymorphism, encapsulation... things they should have shown you in the beginning.

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文章开头部分介绍的便利方法使您可以在记录存储中写入和读取记录。

The convenience methods introduced at the beginning of the article will let you write and read records into the record store.

youdao

这些过滤器和前面介绍的过滤器的工作原理是一样的，并且也是以“：”开头，表明它们是过滤器。

These filters work like the other filters introduced in this article and are preceded with a ":" character to denote they are a filter.

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