1. The reality also testifies the effectiveness of this gradational optimization. 实践证明这种分级优化是有效的。
2. But, since entering 90 age, this kind is added situation begin abate, farming level of herdsman per capita is gradational put delay. 但是，进入90年代以来，这种增势开始减弱，农牧民人均收入水平渐次放缓。
3. intuitional decomposition; gradational decomposition; data mining; association rule; sequential pattern; multiple store; multi-time interval. 直觉拆解；阶段拆解；资料探勘；关联规则；序列型样；连锁商店；多重时间区间。
