The second part ( including the third, four chapters) is the basic research part.
第二部分（包括第三、四章）是基础研究部分。
The second part (including the third, four chapters) is the basic research part.
第二部分(包括第三、四章)是基础研究部分。
The third part includes the last two chapters, this part makes a conclusion.
第三个部分包括七、八章，是得出结论的部分。
The second part (the third and fourth chapters) is the key part of this paper.
第二部分（第三、第四章）是本论文的重点部分。
The second part (the third and fourth chapters) is the key part of this paper.
第二部分（第三、第四章）是本论文的重点部分。
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