三年级的英文：
junior class

参考例句：

The junior class;the junior prom.
三年级生的班级;大学三年级生举办的舞会

The junior prom
大学三年级生举办的舞会

Mike is already a junior.
迈克已经大学三年级了。

Mike is already a junior.
迈克已经大学三年级了。

He left college in his junior year.
他是在大学三年级时辍学的。

I am a sophomore and Miss Yang is a junior.
我是二年级的，杨小姐是三年级的。

The student was demoted from the third grade to the second
那个学生从三年级降到二年级。

a playground foaming with third graders.
操场上聚满了三年级学生

I have graduated him from the second to the third grade
我已使他从二年级升到三年级。

He skipped the fourth grade because of his aptitude.
他因天资聪颖从三年级跳到了五年级。

junior是什么意思：
adj. 地位较低的；晚辈的；年纪较轻的；三年级的
n. 职位较低者；晚辈；三年级学生

There are lots of jobs in junior grades.
初级阶段有很多工作要做。

junior sports development
青少年体育发展

There are separate rooms for senior and junior officers.
高级军官和下级军官的房间是分着的.

He left college in his junior year.
他是在大学三年级时辍学的。

Generally speaking, the female is not junior to the male in wisdom.
一般说来，女孩子和男孩子一样聪明。

class是什么意思：
n. 班级；阶级；种类
v. 分类；把…分等级
adj. 很好的

It is a step class.
这是踏板操训练班。

The class dismissed.
下课了。

The class teacher sectioned the class for dialogues.
老师把班级分组进行对话练习。

The class teacher dismissed the class on time.
教师按时下课。

A second - class letter is slower than a first - class.
二类信比一类信件慢。