main engineering geology problem 主要工程地质问题
The rock failure due to freeze-thaw weathering is a main engineering problem which often occurs in the rock engineering in cold regions.
岩石的冻融破坏是寒区岩石工程中常遇到的主要病害之一。
Hunan Institute of Engineering is a new undergraduate academy established in 2000. Assuring and improving the teaching quality is also its main problem.
湖南工程学院是2000年新建的一所本科院校，保证和不断提高教学质量也是该校面临的主要问题。
How to increase the ultimate recovery factor of oilfield is not only the main problem for oilfield development but also the largest challenge to production engineering.
如何提高油田最终采收率是油田开发面临的主要问题，也是采油工程面临的最大挑战。
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