某些文件系统支持高级的安全特性，比如访问控制列表(acl)。

Some file systems support advanced security features, such as access control lists (ACLs).

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密匙对和安全组的列表在循环外部创建。

The lists of key pairs and security groups are created outside the loop.

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当您创建一个项目时，安全策略是从下来列表中选择的。

When creating a project the security policy is selected from a drop-down list.

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