事务是必须以单个单元(常被称为逻辑工作单元)的形式执行的一组操作。
A transaction is a set of operations that must be executed as a single unit, which is often called a logical unit of work.
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.
事务是一个逻辑工作单元。
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