Through hard efforts made by many scientific research and design units for several years, or several decades, these technical problems have been basically solved.
这些技术问题历数年、数十年之研究，几经众多科研、设计单位刻苦攻关，于今已基本解决确定下来。
Since its foundation in 1979, Shandong Building Material Industrial Design & Research Institute (SDBMI) has been one of the major design and scientific research units of Shandong province.
山东省建筑材料工业设计研究院始建于1979年，是省属重点科研设计单位。
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