困难的名词英文单词difficulty；
difficulty：n.困难；难题；难事；困境；
difficult：adj.困难的；费力的；难做的
The changes were made with surprisingly little difficulty.
这些变化几乎没有遇到阻力，简直不可思议。
We found the house without difficulty.
我们轻而易举就找到了这栋房子。
The tasks have been ranked in order of difficulty.
按照困难程度对工作进行了分类。
温馨提示：
