Class对象为您提供接入类元数据的反射的所有基本hook。

The class object gives you all the basic hooks for reflection access to the class metadata.

youdao

documentattributes类用于保存Document类元数据，比如文档名称、内容类型、语言等。

The DocumentAttributes class is used to keep the document class metadata such as the document name, content type, language, and others.

youdao

它介绍了丙烯酸、丙烯酸脂、苯乙烯四元共聚合成醇溶性聚丙烯酸脂类的方法。

It introduces how to synthesize acrylic acid, acrylate and phenylethene quadripolymer into alcohol-soluble acrylic resin.

youdao

All right, they're not tuples, they're simply an instance with some structuring.

传入这些类的实例，好，他们并不是元组。

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