Tracker's PDF-XChange Pro 2012 ($74) bundles a number of PDF-XChange apps that together attempt to create a suite comparable to the $449 , just for much less money. According to Tracker, PDF-XChange ...

本文介绍了PDF-XChange Viewer这款功能丰富的PDF阅读工具的使用方法。该软件不仅完全免费，还具备多种实用功能，如添加各类标注、多标签页浏览、快速批量搜索、页面放大与导航等，极大提升了阅读体验。它支持将PDF内容导出为图像，操作便捷，效率高。

The Portable Document Format (or PDF) is what most people use to share information because it can show text, images, and even sound and video on any platform. Most PDFs are for reading only, but that ...