* 获取数字的第digit位（从右往左，0表示个位）
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Network egress control — compute isolation means nothing if the sandbox can freely phone home. Options range from disabling networking entirely, to running an allowlist proxy (like Squid) that blocks DNS resolution inside the sandbox and forces all traffic through a domain-level allowlist, to dropping CAP_NET_RAW so the sandbox cannot bypass DNS with raw sockets.，更多细节参见同城约会
Future-Proof: This structure makes it much easier to implement features like alternative route suggestions based on these key border points.，更多细节参见服务器推荐