difficulties的形容词是difficult，例如：
1.Young people today face a very difficult future at work.如今的年轻人面临着充满困难的工作前景。
2.It was a difficult situation, when you think about it.仔细想来，当时处境是很困难的。
3.Children can be difficult as we know only too well.小孩子往往很难对付，对此我们都非常清楚。