他在信封里写到：我只是一个学生，而这是我能做的一个小贡献。

On the envelop he wrote I am only a student, so this is only a small contribution.

youdao

我曾只是一个普普通通的学生。

I was just a very average run-of-the-mill kind of student.

《柯林斯英汉双解大词典》

我只是一个普通的学生。

I was just an average sort of student.

《牛津词典》