四年级的英文：
senior class

参考例句：

On the night of the prom the seniors were on a cloud
学校举行舞会那天晚上，四年级学生都兴高采烈。

The third and fourth grades teamed up to decorate the gym for the party.
三、四年级的学生一起合作，为联谊会布置体育馆。

Skip from the fourth to the sixth grade.
从四年级跳级到六年级。

The seniors defeated the juniors by 3-1.
四年级学生以三比一战胜了三年级学生。

The twins will enter the fourth grade this fall.
这对双胞胎今年秋季将升到四年级。

As a senior, Peter is writing his thesis.
大学四年级学生彼得正在写毕业论文。

He had to repeat the fourth grade.
他读四年级时留级一年。

The Seniors threw a masquerade party on Thanksgiving Day.
四年级学生在感恩节举行了化装舞会。

Last semester I taught third grade and this semester, fourth grade.
上学期我教的是三年级,这学期教四年级。

Seniors of the threshold of the diplomatic career are expected to take this course
希望即将从事外交工作的四年级生选修本课程。

senior是什么意思：
adj. 较年长的；较高的；资历较深的
n. 较年长的人；高年级学生；上司

He is senior to me.
他的职位比我高。

The interests of seniors tend to be . . . varied
老年人的兴趣倾向于…多彩的。

Senior prom, do you have the fever?
毕业生舞会，你有兴趣吗？

Seniors and moms flocked to their booth.
老年人和母亲们蜂拥来到他们的摊位。

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.

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。