没有人知道苹果什么时候会为Nano添加网络连接功能，但如果你打赌说三年之内这不可能，那你就傻透了。
Nobody knows when Apple will add Internet connectivity to the Nano, but you'd be a fool to bet against it happening in the next three years.
poll 的问题是这个结构会非常大，在列表中添加新的网络连接时，修改结构会增加负载并影响性能。
The problem with poll is that the size of the structure can be quite large, and modifying the structure as you add new network connections to the list can increase the load and affect performance.
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