1. The vectorial angle method is employed to evaluate the
validness of every drill-down operation.
本文采用向量夹角法评估下钻操作的有效性，并给出了对应的高效下钻路径裁剪算法。
2. The participation degree and justice of this appraisal guarantees the truth, fairness and
validness of the activity.
这样一个评审的参与度和公正性有利得保证了这次评审结果的真实、公平与有效。
3. This approach and the tool BCM have been applied into the scenario of college-city supermarket and derive reliable experiment results which proves the
validness of the method.
该方法及其工具BCM在大学城超市的案例中得以应用，取得较好的实用效果。
