grading abrasive wheels

例句：

1. 1. The teacher gradings the students' work on a weekly basis.
   老师每周对学生的作品进行评分。
2. 2. The company is grading its employees based on their performance.
   公司根据员工的表现来评定他们的等级。
3. 3. The grades are crucial for determining the student's academic progress.
   成绩对于确定学生的学业进展至关重要。