freshman sophomore junior senior这些是大一学生到大四学生的意思。。
underclass这个有一‘二年级的意思
upperclass这个就是高年级啦~~
不明白你主要要想知道什么的~~level one, level two, level three, and level four of university??
one's moral and character
Freshman,
sophomore,
junior,
senior year
或
First year of college,
Sophomore year,
The university three grade ,
The university of grade four 。
???????