The conference spent days discussing the vexed question of border controls.

会议花了几天的时间讨论边境关卡这个难题。

《牛津词典》

But that vexed question remains.

但是难题仍然存在。

youdao

The best age for marriage is a vexed question.

结婚的最佳年龄是个争论不休的问题。

youdao

That leaves the vexed question of how, and how much, to pay top bosses.

ECONOMIST: Bosses' pay

The vexed question of whether organic farming offers significant benefits over conventional methods has been raging on for years.

BBC: Food: Organic growth?

Mr Powell also returned to the vexed question of Iraqi imports of high-specification aluminium tubes.

ECONOMIST: Dealing with Iraq