不用再检查默认的复合值，您也可以捕获对未定义变量的访问。

Instead of checking for a default compound value, you can also catch the access to an undefined variable. E.g.

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一个复合语句包括一个流控制指令，后跟一个冒号(：)，然后再是一个程序语句块。

A compound statement consists of a flow control instruction, followed by a colon character (:), followed by a block of program statements.

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他们抽取领域范围(销售、供应链等等)并完成业务流程再设计、过程建模、服务鉴别、服务分析和复合应用需求搜集。

They pick a domain area (Sales, Supply Chain, etc.) and perform Process Reengineering, Process Modeling, Service Identification, Service Analysis and Composite Application Requirements Gathering.

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