困难问题

• He applied his mind to the difficulty
  他用心解决这个困难问题。
• Thought on deepening the current financial reform in counties and townships
  解决我国县乡财政困难问题的思考
• A study concerning the difficulty of middle school girls learning physics
  关于中学女生学习物理困难问题的探讨
• New developments in researches on learning disabilities in western countries
  西方有关学习困难问题研究的新进展
• A new traitor tracing scheme on large integer factoring problem
  一种新的基于大整数分解困难问题的叛逆者追踪方案
• His theory contributes to our understanding of this difficult subject
  他的理论有助于我们对这个困难问题的理解。
• Discussion of the finance difficulty after agricultural taxation reform in villages
  农村税费改革后乡镇财政困难问题探讨
• Each success only buys an admission ticket to a more difficult problem
  每一次的成功只是买得一张前往更困难问题的入场券。
• And the decision problems corresponding to those are np ? complete or np ? hard
  而其相应的判定问题是np完全问题或np困难问题
• Her work has contributed enormously to our understanding of this difficult subject
  她的著作极有助于我们对这个困难问题的了解