disputed problem

基本解释

Regulation of the lower Yellow River, especially its wandering reach, has been a disputed problem for long time.
黄河下游河道，尤其是游荡性河段的治理一直是一个有争议的问题。
Whether infringing creditor's rights constitutes conduct infringing rights and assuming damages is a famous disputed problem in the civil law.
侵害他人债权是否构成侵权行为并承担损害赔偿责任，这是民法上有名的争论问题。
But now in the judicatory practice, it is a disputed problem that how to judge whether a ship is on voyage or not.
然而如何认定船舶是否为在航船，在司法实践中却有不小的争议。

Kidnapping is a big problem throughout the region, though just how big and whether it is worsening are disputed.
ECONOMIST: Crime in Mexico