He tried to explain to me the difficulty of learning to cook from books. 他向我解释照着书本学习烹饪的困难。

One of the annoyances of working here is the difficulty of parking near the office. 在这里工作有一件伤脑筋的事，就是在办公处附近很难停车。

Both “feat” and “achievement” emphasize the difficulty of accomplishing something mental or physical. feat和achievement均着重指在脑力或体力方面完成某事物的艰巨性。

注：of后也可直接跟名词作宾语，此时的介词of仍表示所属关系，意为“……的困难”。如：

She has no notion of the difficulty of this problem. 她不了解这个问题的难处。

Do you understand the difficulty of my position? 你了解我处境的困难