服务合成(service composition)是相当复杂的，而且常常涉及到事务、工作单元边界、错误处理、安全性与证书分发、以及业务逻辑聚合等方面的问题。

Service composition is highly complex and often includes transactions, unit-of-work boundaries, error handling, security and propagation of credentials, and aggregation of business logic.

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应用程序域提供了一个更安全、用途更广的处理单元，公共语言运行时可使用该单元提供应用程序之间的隔离。

Application domains provide a more secure and versatile unit of processing that the common language runtime can use to provide isolation between applications.

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