如果非空，那就会在页面上显示这个标签的主体。

If not, the body of this tag will display on the page.

youdao

主体概念是一类特殊的概念：它们是具体的、与主体相关的、非抽象的。

Subject concepts are a special kind of concept: ones that are concrete, subject-related and non-abstract.

youdao

是单一非嵌套主体和任何数量的嵌套主题的容器。

Is the container for a single non-nesting body and any number of nesting topics.

youdao