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1·The new management faces some knotty problems.

新的管理层面临着一些棘手的问题。《柯林斯英汉双解大词典》

2·It was a knotty question.

这是一个棘手的问题。

3·Einstein would furiously play his violin as a way to think through a knotty physics problem.

爱因斯坦会以疯狂地拉小提琴的方式来思考一个复杂的物理问题。

4·Likewise, if one cannot deal with the things in hand, he or she must fail in the following knotty problems.

同样，如果一个人不能处理手头的事情，他或她一定不能解决后续棘手的难题。

5·Under his leadership, many knotty problems were smoothly solved.

在他的领导下，许多伤脑筋的问题都迎刃而解。《新英汉大辞典》

6·The chemistry is knotty for me.

化学对我来说是很复杂难懂的。

7·This is a knotty passage.

这是一段复杂难懂的文字。

8·She met with a lot of knotty problems.

她碰上了许多棘手的问题。

9·Procure a solution to a knotty problem.

解决了一个棘手的问题。

10·Procure a solution of a knotty problem.

找到了一个解决棘手问题的办法。

棘手的

1·The new management faces some knotty problems.

新的管理层面临着一些棘手的问题。《柯林斯英汉双解大词典》

2·It was a knotty question.

这是一个棘手的问题。

3·Likewise, if one cannot deal with the things in hand, he or she must fail in the following knotty problems.

同样，如果一个人不能处理手头的事情，他或她一定不能解决后续棘手的难题。

4·The next knotty question -- and the one probably on your mind at the moment -- is how you input text in non-ASCII fonts.

下一个棘手的问题 —— 也可能是现在正出现在您脑海中的问题 —— 是我们如何以非 ASCII 字体的形式来输入文本。

5·Most worrying, the budget ignores the knotty problem of Italy's feeble growth.

最令人担忧的是，这次预算忽略了意大利极其微弱增长的棘手问题。

疑难

1·This article makes some useful discusses on certain level pointing at several knotty problems upon disputes of corruption crime in theory and puzzle of corruption crime in judicial practice.

本文针对贪污罪在理论上有争议、司法实践上有困惑的几个疑难问题，在一定层次上进行一些有益的探讨。

2·Finally the author use his own new idea explain knotty questions appearing in the history and further analyze and explain the economic reasons causing the structure change in stock index.

随后运用笔者新的提法解释了历史上出现的疑难问题，最后也依笔者的思路分析并解释了上证指数结构突变的经济原因。

3·The paper analyses the knotty problems on remaking Angang old substation in detail and advances the appropriate solving ways.

对鞍钢老变电所自动化改造中出现的疑难问题进行了详细的分析，并提出了相应的解决方法。

4·Abrasion of hydraulic machinery is a knotty problem faced by hydraulic machinery operated in silt laden river in our country.

水力机械的磨蚀是我国多泥沙河流上运行的机组长期以来面临的疑难问题。

5·At the same time, the experiment is an important way to resolving the knotty problem of physics.

同时，实验又是解决物理疑难问题的重要方法。

有结的

1·Ten years ago when computer came into China, Chinese character coding became a knotty problem.

在十年以前当计算机进入中国的时候，中国个性编码变成一个有结的问题。

多节的

1·Depending on the variety its knotty rhizomes range from mustard yellow to lemon yellow.

根据品种，它多节的根茎范围从芥末黄色到柠檬黄色。

(1)knotty problem难解决的问题