1.  abstrusity
2.  abstruseness
3.  obscureness

• 1. 难解: abstruse | Intractable
• 2. 疑难解答: Troubleshooting | FAQ
• 3. 难分难解: Inextricably | be inextricably involved

更多释义

• 1.这本身并不是个难解决的问题。
  In itself, it's not a difficult problem to solve.
  dict.yoduao.com
• 2.很难解释清楚什么原因使他如此走红。
  It is difficult to define what makes him so popular.
  dict.yoduao.com
• 3.我认为这个问题不太难解决。
  I think the problem can be got over without too much difficulty.
  dict.yoduao.com

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