n. a judge who assigns grades to something
n. 把东西分类别的人/机器, 平路机, 推土机
1. The teacher gave each grader a different assignment to complete.
老师给每个年级的学生分配了不同的作业。
2. She is a first grader who loves to read books.
她是一年级学生，喜欢看书。
3. Graders often have to take tests to show their progress.
年级学生通常需要参加考试以展示他们的进步。