In itself, it's not a difficult problem to solve.

这本身并不是个难解决的问题。

《牛津词典》

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Extracting heat from very hot, dry rocks presents a more difficult problem: the rocks must be fractured to permit the circulation of water, and the water must be provided artificially.

从极热的而干燥的岩石中提取热量，暴露出了一个更加困难的问题：必须击碎岩石以保证水的循环，而水必须是人工提供的。

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She began to explain to the students how to solve a very difficult problem.

VOA: special.2009.10.25

It's a difficult problem that not everyone is smart -they vary in their ability -so we try to make a world in which it's pretty safe for the small investor who's not paying attention.

不是所有人都是聪明人,这是个难题,大家能力不同,所以我们试图营造一个环境,一个让小投资者感到安全的环境,而无需忧心忡忡

耶鲁公开课 - 金融市场课程节选

It shouldn't be difficult to see a kind of problem that is beginning to arise in Milton's text here.

这是一个很容易看出的问题,在弥尔顿的作品中也被提了出来。

耶鲁公开课 - 弥尔顿课程节选

Brazile recalled this as the precise moment when she knew Daley could tackle any difficult problem.

CNN: Daley gets down to business

Conservative councillor John Knapman said it was a "difficult problem at this time of year".

BBC: Drivers in Epping Forest warned about rutting deer

But overall, diabetes, driven so intensely by overweight and obesity, "is a terribly difficult problem, " Dr. Weir says.

WSJ: New Strategies for Treating Diabetes