Some people think the _______ problem at present is how to make the students develop

问题描述:

Some people think the _______ problem at present is how to make the students develop
Some people think the_______ problem at present is how to make the students develop by themselves(education)
为什么这里用education,而不是educational
请详细说明,谢谢
一般名词前都是形容器修饰,为什么要用名词
请高手解答

这是名词做作定语,固定的