要看情况
1.老师和学生各只有一个,那就不用加,both teacher and student
2.都不只一个,要加s,both teachers and students
3.其中只有学生或老师只有一个,both teacher and students / both teachers and student(从实际情况来讲,后面这种不太常见)
要看情况
1.老师和学生各只有一个,那就不用加,both teacher and student
2.都不只一个,要加s,both teachers and students
3.其中只有学生或老师只有一个,both teacher and students / both teachers and student(从实际情况来讲,后面这种不太常见)