service domain的用法和样例：
例句
- The service level definitions for users created during the service domain preparation phase are used as contract templates.
服务域准备阶段创建的用户服务级别定义被用作契约模板。 - A main service domain establishes itself as a single logical image of a virtual service made up of multiple service instances.
主服务域将自身建立为由多个服务实例组成的虚拟服务的单个逻辑映像。
