暂且不表其他的错误，让我们使用Kevin提到的最后一个错误来作为结论，那就是浪费的请求量。
We will skip over a few of the other mistakes and conclude with the last one discussed by Kevin, wasteful request quotas.
在以太网络环境里，复杂的规则制约了集线器的拓扑结构和使用范围。考虑到如今应该没人再对如何使用集线器搭建一个规模巨大的以太网感兴趣了，具体细节姑且不表。
Complex rules limit the topology and the use of hubs in Ethernet networks, but I'll skip those as I doubt anyone still has interest in building a large scale Ethernet network using repeater hubs.
INSERT将输入数据添加到表中，并且不更改任何现有数据。
INSERT adds the input data to the table without changing any existing data.
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