小学生，初中生，高中生，本科生，研究生，分别怎么表达，用英语？

小学生：Primary school student或pupil
初中生：Secondary school student或junior middle school student
高中生：Senior school student
本科生：College student
研究生：graduate student

小学生elementary school students
初中生junior high school students
高中生high school students
本科生college students

研究生graduate students

Primary school student/pupil
middle school student
high school student
college students
post graduate students

教科书上的，不相信不对

小学生 pupil
初中生 student
高中生 junior
本科生
研究生

Primary school student/pupil
Secondary school student/junior middle school student
Senior school student
College student
graduate student