It is difficult to separate legend from truth.

传说与事实很难分辨。

《柯林斯英汉双解大词典》

It is difficult to define what makes him so popular.

很难解释清楚什么原因使他如此走红。

《牛津词典》

It is difficult to assess the full extent of the damage.

损失情况难以全面估计。

《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

And so part of the wilderness experience for me I think Mark Twain talks about wilderness and he says, I do it chiefly because it is difficult.

对于我来说，荒野的经验就像是,马克吐温在谈到荒野时所说，因为困难，所以我才去做。

普林斯顿公开课 - 人性课程节选

He says that it is difficult to make the distinction.

他说很难区分。

耶鲁公开课 - 文学理论导论课程节选

Stand somewhere for a few minutes and it is difficult to avoid seeing something move.

BBC: Colombia��s prison turned paradise

From a corporate governance standpoint, it is difficult to argue against more transparency, however.

FORBES: SEC's Political Disclosure Proposal Will Improve Corporate Governance

It is difficult to fathom that Apple executives have their heads buried in the sand.

FORBES: Double Whammy For Apple