6年级3班用英语表达是：Three class, grade six；

class：n. 班; 班级; 课; 上课; (某科目的)系列课程。

grade：n. 等级; (产品、材料的)品级; (官衔的)级别; 职别; 成绩等级; 评分等级。

相关介绍

Does the quality of teaching depend on class size?

教学质量取决于每个班的人数吗？

She has class all right ─ she looks like a model.

她的确丰姿娴雅，看上去像模特儿一样。

In this class, students will learn how to program.

这节课学生将学习编程。

Many children can't function effectively in large classes.

许多孩子在大班上课时学习效果不好。

Milk is sold in grades.

牛奶是分等级出售的。

Why get upset just because you got one bad grade?

何必因为一次成绩不好就想不开呢？

All the materials used were of the highest grade.

使用的材料全是优质品。

You get an A grade for scores of 75 and over.

75分及75以上的分数就是优等。