difficulty在表示困难、艰难的时候是不可数的。表示难处、难题、争论时是可数的。在表示困境、为难、反对、异议时本身就是复数形式。
相关介绍
例句：
You soon get used to the little difficulties.
你很快就会习惯这些小小的不便了。
His increasing financial difficulties forced him to take desperate measures.
不断增加的经济困难迫使他采取了铤而走险的办法。
The company has got itself into difficulties.
公司本身陷入了困境。
The difficulties in her way merely strengthened her resolve.
她所遇到的困难只是让她更加坚定。
Several pupils were designated as having moderate or severe learning difficulties.
几名学生被认定有一定或严重学习困难。
Our jobs overlap slightly, which sometimes causes difficulties.
我们的工作略有重叠，所以有时引起一些困难。
