Achieving these goals is relatively easy in theory, yet quite difficult in practice.

实现这些目标从理论上说比较容易，但在实践上却相当困难。

《柯林斯英汉双解大词典》

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The first question was difficult, but the rest were pretty easy.

第一个问题很难，但其余的都相当简单。

《牛津词典》

"He knows that this suspension of settlement construction is difficult, that it is not easy for anyone;

VOA: standard.2010.01.03

This is actually a piece of code that is really easy to think about recursively and is much more difficult to think about in other ways.

这确实是一段用递归思考起来非常容易,而其它方法特别麻烦的代码,这一段代码的意思就是。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, he's using intuitive-- he says difficult or easy-- so he says it's difficult, meaning the probability is very low, or easy, meaning that probability is high.

所以他直接进行了描述,他用的是困难和简单两词,他说的困难,意思就是概率很小,他说的简单,意思就是概率很大

耶鲁公开课 - 金融市场课程节选

The process might take a few weeks, depending on how easy or difficult it is for you.

FORBES: How to Master Yourself, Your Unconscious, and the People Around You - 1

The information helps bidders estimate how easy or difficult the transition from TV to their own planned services might be, says Laura Fontaine, a Comsearch director.

FORBES: Peeking Into The Spectrum Auction

Identifying the world's greatest male athlete turned out to be easy to argue but difficult to answer empirically.

WSJ: The World's Greatest Athlete?