说明：   我们常常会在各类的技术文章中见到诸如135、137、139、443之类的“端口”，可是这些端口究竟有什么用呢？它会不会给我们的计算机带来潜在的威胁呢？究竟有多少端口是有用的？想要了解的话，就跟我来吧
(We often in various technical articles seen as 135,137,139. 443 like the "port" However, these ports whether what is the use? It will give us the potential of computer threat? How many ports are useful? Want to find out more, come with me)