Gradl格拉德尔gradabbr.毕业生；校友（=graduate)grading choice等级选择grading limits级配范围grads operator微分算子grading values档差grading policy评分政策grading outfit土工平整设备grading sports评分类项目grading factor分级因素,分级系数grading effect分级效果grading gravel级配碎石