n.schoolmate; fellow student
We were classmates in college.
This is our new schoolmate.
She is my fellow students.
v.be a schoolmate of somebody; study/be in the same school
He and she studied in the same school for three years.
We studied in the same school when we were young.
We used to study at a same teacher.
n.comrade (a form of address used in speaking to a student)
Excuse me, could you tell me the way to the museum?
Class one, come here, please.
We seem to be missing some students this morning.
- "同学" is often matched with measure word "个"or"位"or"名".