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。
2
Though considered a backwater, its mining industry was once seen as a key strategic asset.
虽然相当荒僻，但是它的矿业一度被视为关键性的战略资产。
3
A strategic analysis department can undermine their client archives with data mining software to determine what offers they need to send to what clients for maximum conversions rates.