a troublesome problem meaning in English

难问题

Migration is a troublesome problem . it has both advantages and disadvantages but in most cases its advantages is greater
移民,是一个让人头疼的话题.它即有利,也有弊.但在大多数情况下是利大于弊
Time - delay process is very common in industrial plants and it is difficult to control , especially large time - delay process , which has been a troublesome problem
工业生产过程中，时滞对象是普遍存在的，也是较难控制的，尤其是大时滞对象的控制一直是个难题。
Although act has been put in the supreme position by modem criminal law , yet after omission has been concerned by present criminal law , whether omission has nature of act became a troublesome problem for many scholars
近代刑法确立了行为的至尊地位，然而在不作为成为现代刑法关注的对象后，学者们首先就因不作为的行为性问题而大伤脑筋。
From engineering - technical point of view , a first class of pump stations can be built in china . however , improper operation and management for a pump station becomes a troublesome problem . it involves both administration system and economical operation
但长期以来，困扰我国泵站建设的一个突出问题是建成后的泵站运行管理问题，这里涉及到两方面问题，一是管理体制问题，二是经济运行问题。