difficulty既是可数名词，也是不可数名词。表示抽象意义的“困难”，是不可数名词。表示具体意义的“困难”（如难事、难点、难题等），是可数名词。

扩展资料

例句：

Teenagers often have difficulty expressing themselves.

十来岁的孩子在表达思想方面常常有困难。

They showed great perseverance in the face of difficulty.

他们面对困难表现了坚强的毅力。

We're having difficulty keeping up our mortgage payments.

我们难以继续偿还按揭贷款。

Something gave me the strength to overcome the difficulty.

有件事给了我克服困难的勇气。