He has no conception of how difficult life is if you're unemployed.

他不懂得失业后生活会是怎样的艰难。

《牛津词典》

We didn't understand how difficult it was to distribute a national paper.

我们不明白配销一份全国性的报纸有多么困难。

《柯林斯英汉双解大词典》

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So,just being able to pick one of those up will help our visitors understand how difficult portability was about thirty years ago."

VOA: special.2011.02.15

There is a lot of research in psychology, a lot of evidence that shows how difficult change is.

心理学的研究有很多，很多证据显示，改变是非常困难的事。

哈佛公开课 - 幸福课课程节选

There is a lot of research showing how difficult it is to change happiness based on external factors.

很多研究表明,基于外在因素改变快乐很难。

哈佛公开课 - 幸福课课程节选

But the drug's success highlights how difficult it is for pharmaceutical firms to invent new medicines.

FORBES: Pfizer's New Blockbuster Drug

Monday's events show how difficult it will be to clean up local police forces.

WSJ: Mexico Cracks Down on Local Police Corruption

Garib also acknowledged how difficult a task the Egyptians had in winning yet another African title.

BBC: Ghana 0-1 Egypt