大学不同年级的学生分别对应的英语单词

大一 freshman
大二 sophomore
大三 junior
大四 senior

在United States:
First year -- a freshman
Second year -- a sophomore
Post-second year third year -- a junior
Post-second year fourth year -- a senior

As you know that, in different countries or even at different universities, they use different words to represent people who study at the universities. Like in UK, the term "student" is reserved for people studying at University level.