it has great theoretical significance 具有一定的理论意义
great theoretical and practical significance 具有重大的理论和现实意义
It has great theoretical significance and practical value.
具有一定的理论意义和实用价值。
This study has great theoretical significance and practical values as well.
这一研究既具有理论意义，也具有重大实践价值。
Therefore, this study is of great theoretical significance and engineering significance.
因此，这一方面的研究，具有重大的理论意义和工程意义。
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