difficult所有形式

名词形式是difficulty，复数形式是difficulties，例如：

1、They showed great perseverance in the face of difficulty.他们面对困难表现了坚强的毅力。

2、One of the staff saw he was in difficulty and came to his aid.一名工作人员见他有困难，便过来帮忙。

3、I think the problem can be got over without too much difficulty.我认为这个问题不太难解决