userid

n.用户标识符

You know that each person has a user name called a userid. 人们都知道，使用计算机的每个人都有一个用户名，叫做用户标识符。

It is this userid that we use as the first part of someone's address. 正是这个用户标识符，我们把它作为某个人网址的第一部分。