third grade。

短语：

the Senior Grade Three高三年级。

in Grade Three在三年级。

Senior Grade Three高中三年级。

例句：

1、Her daughter studies in the third grade in a junior high school.

她的女儿在一所初级中学读三年级。

2、Ispent my junior yearinFrance.

我三年级是在法国念的。

3、Skip From The Fourth To The Sixth Grade.

从四年级跳级到六年级。

4、He Had To Repeat The Fourth Grade.

他读四年级时留级一年。

5、The Primary Grades In School Are Grades One Through Three.

学校的低年级是一年级到三年级。

6、The Boy Was Kept Back In The Fourth Grade.

男孩在四年级时留级。