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。

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

《柯林斯英汉双解大词典》

对于许多学校来说，要找到关于这个问题的可靠统计数据是相当困难的。

It is actually quite difficult to find reliable statistics on the issue for many schools.

youdao

到目前为止，机器在模仿创造力方面有相当困难的时间，它们的随机性足以让计算机无法预测，但也不仅仅是简单的随机性。

So far, machines have a pretty hard time emulating creativity, arbitrary enough not to be predicted by a computer, and yet more than simple randomness.

youdao

And the prospect of having a lot of time to pursue math problems of a richer and deeper sort seems fairly attractive.

要是能有时间,解决更困难更深奥的数学问题,对我相当有引吸力。

耶鲁公开课 - 死亡课程节选

And the fact of being asked to do ten positive features is people find this hard.

实际上大家都会发现,要列举出某人的十个优点,是相当困难的。

耶鲁公开课 - 心理学导论课程节选

It' s very, very difficult to chase after a wave.

追随潮流是件相当困难的事。

普林斯顿公开课 - 领导能力简介课程节选