异常需求（Abnormal Demand）
异常抛出错误条件实际上是实现需求(见以下部分)，应该在“需求”或“实现注意事项”部分中列出。
An exception-toss error condition is really an implementation requirement (see below) and should be listed in the "Requirements" or "implementation notes" sections.
所以除了业务需求和规章外，策略也可能被强制使用异常，或者要求转换。
So in addition to business requirements and regulations, policies may also be enforced using exceptions or require transformation.
在完成了第一轮需求分析后，您手中拥有的这些叙述性说明会使程序的异常处理设计更为合理且更有价值。
With a first round of requirements analysis complete, the narrative notes you have in hand will make design of your program's exception-handling far more rational and rewarding.
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