There is little deep study about this issue in the theoretical circle.
而理论界对此又缺乏深入研究。
Study on the thickness of frozen wall in deep alluvium;
冻结壁的安全性是深厚冲积层中冻结凿井的关键问题。
So the study on the deep back filling technology has great significance in mining practice.
因此，研究深井充填技术具有重大的现实意义。
Deep study has been conducted on the hot issue in this paper.
本论文即对这一现实热点问题进行了深入研究。
Deep study has been conducted on the hot issue in this paper.
本论文即对这一现实热点问题进行了深入研究。
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