n.分类机；(中小学的) ... 年级学生
This paper introduces the lower bear's improvement of screw grader. 文章介绍螺旋分级机下部轴承的改造实践。
The movie tells the story of fifth grader Jesse Aarons. 电影讲述了五年级学生杰西·阿伦斯的故事。
I remember, as a third grader, visiting my great-grandmother. 我还记得上三年级时，去拜访我的祖母。
