greyingadj.灰白的动词grey的现在分词.greyadj.灰色的n.灰色vi.变成灰色=<美>graygrey dynamic programming灰色动态规划grey forecasting methods灰色预测grey duck primary covert灰鸭小关刀Grey-headed flying foxn.灰首狐蝠grey correlations degree灰色关联度分析grey cotton yarn in hanks绞线grey hierarchy evaluation灰色多层次评价grey relation coefficient灰关联系数grey associative analysis灰色关联分析grey fixed weight cluster灰色定权聚类