To allow all traffic by default and deny only what you want to restrict.
默认允许所有流量，只拒绝您限制的。
To deny all traffic by default and allow only what you want to be permitted.
默认拒绝所有流量，只允许您许可的。
Firstly, the default policy is always to deny access.
首先，缺省的策略总是拒绝任何访问权限的。
If the permission cannot be found, the default action is to deny the permission.
如果找不到相应的权限，默认操作是拒绝该权限。
If the permission cannot be found, the default action is to deny the permission.
如果找不到相应的权限，默认操作是拒绝该权限。
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