Use this skill whenever the user wants to do anything with PDF files. This includes reading or extracting text/tables from PDFs, combining or merging multiple PDFs into one, splitting PDFs apart, rotating pages, adding watermarks, creating new PDFs, filling PDF forms, encrypting/decrypting PDFs, extracting images, and OCR on scanned PDFs to make them searchable. If the user mentions a .pdf file or asks to produce one, use this skill.

当用户需要对PDF文件进行任何操作时，请使用此技能。这包括从PDF中读取或提取文本/表格、将多个PDF合并为一个、拆分PDF、旋转页面、添加水印、创建新的PDF、填写PDF表单、加密/解密PDF、提取图像，以及对扫描的PDF进行OCR处理以使其可搜索。如果用户提到.pdf文件或要求生成PDF，请使用此技能。