gradus

例句：

1. 1. The students are at different grades in their studies.
   学生们在学习上有不同的水平。
2. 2. The teacher gave the students a quiz to assess their gradus.
   老师给学生们一个测验来评估他们的水平。
3. 3.The company has set up different gradus for its employees.
   公司为员工设置了不同的级别。