there are more students in class one than in class two/those in class two?

题目

there are more students in class one than in class two/those in class two?
比较级必须在同类事物间进行比较,请举例说明

答案

这不就是个很好的例子吗?
there are more students in class one than those in class two
those 就是指代 students
如果去掉,那就变成1班的学生和2班(这个班级,而不是班里的学生)进行比较了!