It has something to do with the difficulty of the activities in question.

这与所讨论的活动的难度有关。

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When disaster comes, we can not avoid, we can do only with strong and smiles to the world that we are strong, no difficulty can make us lose the hope of Health.

当灾难来临时，我们不能逃避，我们能做的只有用坚强和微笑去向世人证明，我们是坚强的，任何困难都不能使我们失去生的希望。

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Despite some excitable recent talk of sharing a carrier with France, the difficulty of agreeing what to do with such a Shared vessel make that idea unworkable.

尽管最近出现了一些与法国分享一首航空母舰的疯狂言论，但就如何使用这样一个共同使用的航母的困难使的这一想法根本行不通。

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A writer like Mary Astell can employ Milton's revolutionary rhetoric to advance a cause to which John Milton himself would of course ; have had difficulty subscribing; a dead Milton could exercise a social power that had nothing whatsoever to do with the living Milton's own social views.

一个像玛丽·阿斯苔这样的作者可以用弥尔顿的革命性语言,来推动一项事业，一项约翰·弥尔顿本人当然很难,赞同的事业;,死去的弥尔顿竟然能够操纵与生前弥尔顿的社会观点,毫无关系的社会力量。

耶鲁公开课 - 弥尔顿课程节选

This, by the way, is Diaz's third movie in recent memory that has to do with her having difficulty pulling off a wedding.

CNN: Review: Darkness in 'Very Bad Things' nearly works

Despite some excitable recent talk of sharing a carrier with France, the difficulty of agreeing what to do with such a shared vessel make that idea unworkable.

ECONOMIST: The future of British defence

Dame Carol recommended that the new service offer advice on issues which might be affecting a person's ability to do their job, such as debt or difficulty with their line manager.

BBC: Pilot scheme tackles long-term sickness absence