最后对全文进行总结，并对进一步研究的问题进行了展望。
In the end, this paper is summarized and the further research is presented.
最后对全文进行总结，并针对研究得出结论提出一些政策建议。
Finally, in full text summary, according to the research conclusion, we bring up the suggestion of some policies.
最后对全文进行总结，对有待继续研究的工作提出初步设想。
Lastly, a conclusion of this thesis and the discussion of future research directions are given.
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