The challenge in working bottom up is that it may be hard to map Strategic and Tactical requirements that were defined before the rule mining unless there is additional metadata and context available.
从下到上的方法的难点在于可能在规则挖掘之前会很难确定战略战术需求，除非有额外可用的元数据和上下文。
The operational procedure (i. e. software) plays an important rule in new type electric equipments; the software defects affect electric equipment tactical and technical performance.
操作程序（软件）已成为新型电子装备的重要的组成部分，软件中存在的缺陷影响电子装备的战术与技术性能。
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