difficult的名词困难

　　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。