以色列和巴勒斯坦之间的斗争是个难解的问题，长时间都难以解决。
The Israelis and Palestinians are in a conflict which is a Gordian knot that may not be resolved for a long time.
经典的数学方法和力学方法对大多数接触问题都难以解决，需用数值计算方法来进行分析。
It is difficult to solve it by traditional mathematic and mechanical methods, so the numerical value analysis is used.
世界性的饥饿问题是个极其难以解决的问题，我恐怕人们在我这一辈子都找不出解决的办法。
The question of world hunger is a very hard nut to crack . I doubt if we'll find the answer to it in my lifetime.
这两本书都解决了史学家和姓氏学家长期迷惘而难以解决的一些问题。
Both the two books have solved some of the problems that puzzled historians and surname experts for a long time.
认为“人的物质需求是无限的”这种观点，无论在理论上或实践上都遇到了难以解决的问题。
The concept that "human beings have unlimited material needs" should be critically examined again since it is being severely challenged both in theory and in practice.
认为“人的物质需求是无限的”这种观点，无论在理论上或实践上都遇到了难以解决的问题。
The concept that "human beings have unlimited material needs" should be critically examined again since it is being severely challenged both in theory and in practice.
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