它们各自之间没有联系，不像一套教科书那样，按照书中问题的难易程度，或专业的深浅分级别类。

They are not related to one another as a series of textbooks, graded in difficulty or in the technicality of the problems with which they deal .

youdao

用机械化方法证明几何定理，适当选取坐标系是一个关系到问题解决得难易程度的重要步骤。

In applying the method of mechanization to verifying geometric problems, to choose a proper coordinate system is an important step that concerns the complexity of the solution to the problem.

youdao

深基坑支护的可靠性、安全性、经济性和实现的难易程度是工程技术人员必须综合考虑的问题。

Engineering technician should consider synthetically the problem of the reliability, safety, economic of the deep foundation pit supporting, and the difficult degree of putting it into effect.

youdao