应用灰色系统理论，由油井重复压裂前的递减产量，生成相应的一阶累加序列，由累加序列建立了灰色预测模型GM (1,1)。
A grey predicting model of GM (1, 1) can be established with the accumulated sequence generated by the oil well decline rate before refracturing according to the theory of grey system.
建筑物的规模朝上部楼层递减，其中前四层与路面垂直对齐，但是顶部的两层略有倾斜。
The scale of the building diminishes towards the upper floors, with the first four levels vertically aligned with the pavement, but the top two floors inclining towards a point.
近50年来，南方8省的水土流失面积在1985年前呈增加趋势，1985年以后呈现递减趋势。
The results also show that the total eroded area increased before 1985 and decreased after that in the last 50 years.
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