difficult的四种词性名词difficulty，形容词difficult，副词difficultly，没有动词。
difficult
adj. 困难的；不随和的；执拗的
例句
It\'s difficult to tell them apart.
很难把他们区分开来。
It was a rather difficult question.
这是个相当难的问题。
It was a difficult birth.
那是一次难产。
It was rather a difficult question.
这真是个难题。
广州站房产新闻
