difficulty后面跟doing还是to do（difficult后接to do还是doing）

difficulty后面跟doing不是跟to do，因为这是固定搭配difficulty 后面省略了介词in

例如，每个人在学习上都会有提高成绩的困难，但只要我们认真对待学习困难就可以迎刃而解。

For example, everyone will have difficulties in learning to improve their grades, but they can be solved as long as we take them seriously.