The orbit of one particular comets was a very difficult mathematical problem.
一个特殊彗星轨道是一个非常困难的数学问题。
The problem of cathode design is the key and difficult one should be solved first.
阴极设计是电解加工首先要解决的问题，也是电解加工中难以解决的问题。
Humes problem is a quite difficult one in the history of philosophy of logic.
休谟问题是逻辑哲学上的一大难题。
Image segmentation is one of the classic problem and difficult area of digital image processing.
图像分割是图像处理领域中的一个经典问题也是一个难题。
The problem with the old one, a lot of people would have said this that actually it's quite difficult to break off a slice.
老版有一个问题，很多人也都说过，就是很难掰下一个巧克力。
The problem with the old one, a lot of people would have said this that actually it's quite difficult to break off a slice.
老版有一个问题，很多人也都说过，就是很难掰下一个巧克力。
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