可以通过专门化基础主题DTD的结构来引入新的信息类型。

A new information type can be introduced by specialization from the structures in the base topic DTD.

youdao

这些元素都是从基础主题中的节标题（section heading）类扩展而来，这允许单个标题元素包含多个段落。

These elements are all extended from the section heading class in the base topic, which allows a single heading element to contain multiple paragraphs.

youdao

他的作品大部分都是以这些主题思想为基础。

These ideas underlie much of his work.

《牛津词典》

Then next lecture--I want to come back to some basic themes that--the third lecture-- about technology and it relates to another book that I wrote.

再后面的一讲...就是第三课...,将会回到基础的主题中,会讲到金融技术,这涉及到,另外一本鄙人的拙著

耶鲁公开课 - 金融市场课程节选

We've been talking about more basic, more biological subjects.

我们已经讲了一些较为基础的生物学主题

耶鲁公开课 - 生物医学工程探索课程节选