7.四名“学生”。school-age children，pupil，middle-school student，college/university student
（1）school-age children：学龄儿童。如：
What’s the school attendance rate of school-age children?
学龄儿童的入学率怎么样？
（2）pupil：小学生。如：
Pupils are developing normally now.
如今，小学生的发育都很正常。
（3）middle-school student：中学生。如：(https://www.daowen.com)
Middle school students should obey the traffic rules strictly.
中学生应该严格遵守交通规则。
（4）college/university student：大学生。如：
All college students plant tress voluntarily every year.
所有的大学生每年都义务植树。