service class的用法和样例：
例句
- The routing handler uses a properties file to map service level values to target service endpoints.
路由处理器使用一个属性文件来映射服务级别值到目标服务端点。 - 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。
