1) A nasty puzzle; a nasty problem.
难以解决的疑团;难以解决的问题
2) a nasty puzzle
难以解决的疑团
3) a devilish problem to solve
极难解决的问题
4) intractable
[英][ɪn'træktəbl] [美][ɪn'træktəbḷ]
难解决的
1.
Based on the scope of question an d the scale of resolution,the concerns can be divided into basic,manageable,and intractable solutions,and reached to a conclusion on challenges probably found in Chinese e-commerce and logistics for the time being and the fu.
基于问题的范围和可能的解决方案的尺度,将问题按照特征划分为基本的、可处理的和难解决的等三种类型。
5) An inextricable problem.
无法解决的难题
补充资料：难以
1.不能﹔不易。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条