对应于xetex所生成的xdvi文件到pdf文件的转换工具，对于研究pdf文件很有帮助。-Corresponds to xetex generated by xdvi documents to the pdf file conversion tools useful for studying the pdf document.

把CAD图纸转换为PDF，方便技术交流，在没装AutoCAD的电脑上也看CAD图纸。-Convert the CAD drawings into PDF, and facilitate technology exchange the computer without AutoCAD installed can see CAD drawings.