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It was difficult to understand the local dialect.

这种方言很难懂。

《牛津词典》

It is difficult to understand the full import of this statement.

很难理解这份声明中的全部含意。

《牛津词典》

Today,the solution to the problem is so common that it is difficult to understand that there was a problem at all.

VOA: special.2010.07.14

He says,"There are many things in Paul's letters very difficult to understand. And some people twist them to their own destruction as they do other kinds of scripture."

他说“保罗的书信里有很多,难以理解之处，而有些人曲解它们,这是自取沉沦，正如他们对待其他圣典一样“

耶鲁公开课 - 新约课程节选

A little indirect but not so indirect that is difficult to understand. You should use this often.

有一点委婉，但不至于委婉到让人难以理解。应当尽量多使用这种句型。

Why don't 课堂 - SpeakingMax英语口语达人

Marseille coach Didier Deschamps added that the postponement of the game "was difficult to understand".

BBC: Postponement angers French clubs

This is a point very difficult to understand for industry producers, according to Valenzuela.

FORBES: The Science of Tequila (Snobbery)

But scientific information can be difficult to understand and even more difficult to explain to others.

UNESCO: Science Communication