security functions的用法和样例：
例句
- Security policy defines several code groups and associates each of them with a set of permissions.
安全策略定义若干代码组并将每个代码组与一个权限集关联。 - Devising a network security policy can be complex because a rational policy requires an organization to assess the value of information.
设计安全策略是复杂的，因为一个合理的安全策略需要组织去评估信息的价值。
