第四章结论部分，着重概括全文内容。
The forth chapter: the conclusion, sums up the content of this dissertation.
结沦：概括全文的主要观点及主要研究成果。
Conclusion:summary the whole article's main points and main research results.
结论部分概括全文内容并指出本文的不足之处。
Concluding remarks generalizes the content of the thesis and points out disadvantages of it.
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