Gradea格拉代亚graden.等级；年级；成绩；斜坡v.分级；评分；渐次变化graded defense等级保护grade teaching分级教学grade analysis级别分析grade forecast等级预测grade by sized按大小分级graded modules分次模grade A nickel甲级镍graded-index缓变折射率grade labeling分等级graded algebra分次代数