Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
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，更多细节参见safew官方版本下载
// 倒序遍历2*len-1次：模拟数组循环（核心！易错点1）。业内人士推荐爱思助手下载最新版本作为进阶阅读
But previous analysis by the BBC Shared Data Unit estimated that the defences not maintained by the EA were 45% more likely to be below target.。业内人士推荐heLLoword翻译官方下载作为进阶阅读