The problem is difficult to understand.

这个问题难于理解。

youdao

The problem is difficult to solve in field of bellows designing.

该问题是波纹管设计的难点之一。

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Why is the obesity problem in Britain so difficult to solve?

为什么英国的肥胖问题如此难以解决？

youdao

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

Part of the problem with using operant conditioning with babies is it's difficult to get them to behave in any systematic way.

应用操作性条件作用的部分问题在于,很难使婴儿们按照系统的方式行动

耶鲁公开课 - 心理学导论课程节选

There was a conditional agreement: yes, Norway should manage this oil risk but it's politically difficult and that's the problem-- is that we're not able to do our optimal management.

他们在一定程度上同意我的观点：,是的，挪威应该设法解决石油的风险,但这在政治上很困难,其问题在于-,挪威无法做到最优的管理。

耶鲁公开课 - 金融市场课程节选

The problem is that it is difficult to conduct studies of RF in the laboratory using cells and animal models.

FORBES: Should The FCC Re-Examine Cell Phone Radiation?

When asked how long it might take the company to fix the problem, Marquard said it is difficult to provide a specific timeline.

FORBES: Medtronic Sees Revenue Growth Despite Unaddressed Quality Concerns

The problem is leverage can be difficult to unwind at just the right time and can lead to large losses when things go wrong.

FORBES: Fed Announces New Treasury Buying Plan; Investors Uninspired