"So,I think this is a normal hiccup in a very difficult process.

VOA: standard.2009.10.26

and a number of things that are just, sort of, difficult for human beings to process and make intelligent decisions.

还有一系列，人们难以去控制,并且做出正确决定的事情。

耶鲁公开课 - 金融市场课程节选

Yes. I think that the writing process is very difficult.

是的。我觉得写作的过程是很艰辛的。

灵感从何处来 - SpeakingMax英语口语达人

There is this audit and recount process. It is difficult to put a timeline to both of these activities at this point."

VOA: standard.2009.09.15

He said Palestinians are waiting for the Americans to cancel that decision because it will be difficult to see the process restarting with this kind of action in place.

VOA: standard.2010.03.11

President Obama acknowledges the election process in Afghanistan was difficult.

VOA: standard.2009.11.02

General Myers acknowledges that process has been made more difficult by the uncertain outcome of the Afghan presidential election, and allegations of widespread fraud by supporters of President Hamid Karzai.

VOA: standard.2009.10.16