Even with more traffic and fewer sidewalks, modern parents do have one advantage their parents didn't: the cell-phone.
即使有更多的交通和更少的人行道，现代的父母有一个他们的父母没有的优势：手机。
2
If a cell needs to be removed for maintenance or an upgrade, the load balancer can be directed to send traffic to just the cell that is running.
如果由于维护或者升级的原因需要移除一个单元，负载均衡器可以把流量直接发送到正在运行的那个单元。
3
A two - (or more) cell strategy provides the capability to divert traffic to an alternate cell (cell b) while maintenance is being applied to a primary cell (cell a).