注意，如果使用标记类，那么只能把这些类添加到定义的相关标记中。

Note that with tag-class selectors, you can add them only to the tag for which you defined the class.

youdao

这种分类方法通常是基于一个特定的假设：已标记类的样本是完全样本。

This kind of classification often is based upon a given premise: the marked sample is the whole sample.

youdao

对特定的HTML标记使用类要想创建应用于特定HTML元素的标记类样式，首先要计划标记方案以及相关的样式变体。

Using classes with specific HTML tags to create tag-class styles to use with a specific HTML element, begin by planning a scheme of tags and their related style variations.

youdao