A rule may contain multiple groups, and a user must belong to all groups for the condition to be successful.
一个规则可以包含多个组，用户必须属于所有的组才满足条件。
Users can also be assigned individual roles within a Community, outside of user groups, and can have multiple roles.
用户也可以被分派到一个Community的单独角色，外部用户组，以及可以拥有多个角色。
Please note that, if a user is a member of multiple recipient groups, the GroupResolver class enlists him only once.
请注意，如果用户是多个收件人群组中的一员，那么groupresolver类只列出该用户一次。
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