这一次的研究太零散，难以发挥重大的作用。

The research is too unfocused to have any significant impact.

《牛津词典》

第一，对违反规范者难以发挥制裁的效果。

First, it's difficult to crack down on violators.

youdao

如果一个孩子没能学会如何有效地记忆，他将难以发挥他的最大潜能。

If a child doesn't learn how to memorize effectively, he doesn't reach his full potential.

youdao