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难题
1、describing the problem───描述问题
2、difficult problem───难题；难问题
3、address the problem───解决问题
4、more difficult───更难的（difficult的比较级）
5、addressed the problem───解决问题
6、difficult───adj.困难的；不随和的；执拗的
7、solving the problem───解决问题
8、difficult tasks───艰巨的任务
9、problem───n.难题；引起麻烦的人；adj.成问题的；难处理的
1、Now, the difficult problem for any theory of biological design is to explain the massive statistical improbability of living things.───现在，一个在所有生物设计论都难解决的问题是怎样去解析物种生存的极高的统计上的不得能性。
2、Companies will have no choice but to face the difficult problem of managing older workers.───公司除了正视管理老年劳力的困难问题外将别无选择。如何鼓励高龄员工去适应新做法，新技术？
3、The student decided to work out the difficult problem by himself.───这个学生决心独自解决这道难题。
4、We're trying to solve the difficult problem by ourselves.───我们正设法自己解决这个难题。
5、The difficult problem that still awaits an answer is how to get higher yields from food crops without a commensurate rise in the loss of water through evapotranspiration.───困难的问题是，仍在等待怎样获得与蒸散而损失的水相对应的食用作物产出。
6、He soon turned his attention to the difficult problem.───他很快把注意力转到这个难题上。
7、The question of water leakage from the cold fresh pork is always the difficult problem of the puzzle slaughter in the enterprise.───冷鲜白条肉出水问题一直是困扰屠宰企业的难题，也是影响白条肉质量的重要因素。
8、It designed the flow of the smart-listen system, then solved the difficult problem in development of the system.───设计了XiTong智能监控流程，从而解决了XiTong开发运行的难题。
9、The difficult problem is satisfactorily solved. The machining precision and the surface quality reach the design requirements.───初步解决了该加工难题，加工精度、表面质量均符合设计要求。
1、He soon turned his attention to the difficult problem.
2、The sub-system of Project Monitor resolves the difficult problem of monitoring the project's real-time status by the managers and has a certain analytic function for the statistic data.
3、I've just had a brainwave ; I know a new approach to the difficult problem!
4、The Geometer's Sketchpad resolved the difficult problem in inquiry learning, which is to establish the situation of student-centred learning, in the mathematics classroom.
5、We're trying to solve the difficult problem by ourselves.
6、The difficult problem of over-temperature for furnace wall was basically solved by furnace liner revamping, in terms of both the material and structure.
7、Constituent structure is unreasonable it is the difficult problem that puzzles machinist job fitness to develop.
8、He clarified the difficult problem by giving a full explanation.
9、GIS can deal with the difficult problem. GIS can digitize the unwieldiness map and provide us with facile reliable search and this makes management of mobile communication pipelines easy.