Tracking files get onto websites, and downloaded to a computer, in several ways.
追踪文件上传到网站，然后又以几种方式下载到计算机。
2
It then analyzed the tracking files and programs these sites downloaded onto a test computer.
之后分析了由这些站点下载到测试计算机上的追踪文件及程序。
3
The tissue library is also protected against loss and misplacement by a meticulous computertracking system that involves bar codes and human-readable numbers.