graders
分级机
分类机
……年级学生
[建]平地机（grader 的复数）
例句
The play is open to all seventh and eighth graders.
所有七、八年级的学生均可观看此剧。
《牛津词典》
16 percent of eighth-graders were held back for poor performance.
16%的8年级学生因为成绩差而被留级。
《柯林斯英汉双解大词典》
One in three fourth-graders couldn't find their state on a map of the U.S.
四年级学生中有三分之一在美国地图上找不到自己所在的州。
