，便将搜集的一些有关PID的资料稍作整理，另加个人理解上传论坛共享。

本文着重从实际应用的角度谈一下这些内容，而不做较深层次的分析，难免有错误或者

不全面的地方，请大家指正，-Points, it will collect some information about PID minor finishing, plus a forum for sharing personal understanding of upload. This article focuses on the practical application point of view to talk about the content, and no deeper level of analysis, it is inevitable that errors or incomplete areas, please correct me, thank you