最后，对全文的工作进行了总结，分析了存在问题和缺陷，并对今后的研究方向做了展望。
Finally, the paper has a summarization on the researching work, analyzing the problems and shortcomings, giving a series of vistas to the future direction of research.
最后总结了全文所作的工作，并对尚有待于解决的问题和以后的主要研究方向做了简单的说明。
Summarized the work done finally, and to the problem that still waits to be solved and studying the direction mainly and doing the simple explanation afterwards.
最后，对全文研究做了总结，指出研究的不足以及一些改进的方向。
At last, concludes research done in whole paper, pointed out the lack of research and some directions for improvement.
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