Actually, there're just a few topics used there and you can find sample answers to most of them and useful vocabulary in the PDF document.

实际上，这部分只使用了几个话题，你可以在 PDF 文档中找到大部分话题的示例答案和有用的词汇。

So, for example, someone sends you a PDF document, and you try to look at or open that file in your Microsoft Word program.

因此，例如，有人向您发送 PDF 文档，您尝试在 Microsoft Word 程序中查看或打开该文件。

This plugin is quite a handy tool for comprehending and extracting information from extensive and complex PDF documents such as textbooks, reports, contracts, books, and papers.

这个插件是一个非常方便的工具，用于从大量复杂的 PDF 文档（如教科书、报告、合同、书籍和论文）中理解和提取信息。