Once we're done serving Hank, we can read Hank's next pointer, and update our " post office queue" pointer to the next person in the line.

一旦我们完成了对 Hank 的服务，我们就可以读取 Hank 的下一个指针，并将我们的“邮局队列”指针更新为队列中的下一个人。