It was a knotty question.

这是一个棘手的问题。

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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。

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The bank drew up a fresh index to get around the knotty problem of defining "urban"; this new measure puts the world's city-dwelling population at about 47% in 2000.

世行新创了一种计算方法，绕过了棘手的“城市”定义问题，得出2000年世界城市居民人口约占(世界总人口的)47%。

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For the rest of us, Topshop presents a knotty dilemma: the rewards can be great (a leather biker jacket I bought seven years ago is still regularly mistaken for Balenciaga) but the sacrifices are akin to a root canal (confusing layouts, too much clothing and herds of teenagers roaming with hyena-like intensity).

WSJ: Tina Gaudoin on Style: How to Wear Topshop Past 25

It was the Poincare conjecture, a knotty problem involving circles and spheres, which had dogged mathematicians for a century.

BBC: 7 questions on prizes

Personal animus aside, the suit raises a knotty question of responsibility.

FORBES: A tiny rival accuses Thomson Corp. of espionage.