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.
And that makes it for me a very exciting time to study this because the problems aren't solved in the way that bridge building is largely a solved problem now.
对于我而言,这是一个非常激动人心的时代,因为一百年前桥梁建设中难以解决的问题,在今天都得到了解决
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