已经导入了多个公共策略集，可供附加到服务和客户端组合单元。
Several common policy sets are already imported and ready for you to attach to your service and client composition unit.
我们学习新单元：你好，世界！我们学习有关公共地点、物品和服务的内容。
We are into our new unit titled: Hello, World! We are learning about community places, goods, and services.
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