There are a large number of historical vestiges and cultural relics in Gansu, but because of various reasons, there are also many problems and difficulties with regard to the archaeological work.

甘肃有着大量珍贵的历史文物和遗迹，由于历史原因和各种条件的制约，文物工作存在的困难和问题较多。

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Compare to the city construction, the rural community construction will face more difficulties and various problems will appear during the construction.

农村社区建设相比城市建设而言将要面对更多的困难，在建设过程中也会出现各种各样的问题。

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For solving various water wave problems, especially nonlinear ones, people have been attempting to overcome the difficulties caused by the huge computational cost and storage in the computer.

在众多水波问题，尤其是非线性水波问题求解中，巨大计算量和存储量一直是人们试图克服和解决的重点与难点。

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