指出本研究中存在的问题与不足，以及后续研究的展望与设想。
Point out problem and deficiency existing in this research, the prospect and imagination of follow-up study.
分析了聚氯乙烯厂电石法生产PVC原有水洗装置存在的问题与不足。
The existing problems and shortages of original PVC water units by calcium carbide method were analysed.
最后，对全文进行总结，得出最终结论，反思研究中存在的问题与不足。
Finally, this text summarizes the full text, draws the final conclusion and reviews problem and deficiency in research.
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