The paper can be divided into six parts and its main contents are as follows: in introduction part, it mainly gives a brief explanation on modern environmental problems.
全文共分为六个部分，其主要内容如下：引言部分主要对现代的环境问题进行了简单阐述。
The thesis is divided into five parts as follows: "introduction" presents a brief biography of Lyman Frank Baum and a brief introduction to the Wonderful Wizard of Oz.
本论文共分为五个部分：“引言”部分简要介绍作者莱曼·弗兰克·鲍姆的生平以及小说《绿野仙踪》的主要情节。
The thesis is mainly composed by three parts as follows: in the first part, it is a brief introduction of Pan Yuliang all her life.
本文主要分三个部分，第一部分主要对潘玉良生平做个简短的梳理。
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