pdf
(Portable Document Format)
pdf 是一种文档文件格式, 包含文本、图像、数据等。此文档类型是独立于操作系统的。它是一个开放的标准, 压缩文档和矢量图形。如果在浏览器上安装了 pdf 插件, 则可以在 web 浏览器中查看它。
PDF is a document file format that contains text, images, data etc. This document type is Operating System independent. It is an open standard that compresses a document and vector graphics. It can be viewed in web browsers if the PDF plug-in is installed on the browser.