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It has been estimated that an additional one-fourth of the Earth's land surface is threatened by this process.
句子
It has been estimated that an additional one-fourth of the Earth's land surface is threatened by this process.
问题
句子分析（俗称“长难句分析”）是训练提高基础阅读能力的有效手段。我们通过对托福(TOEFL)、雅思(IELTS)、GRE、考研以及四六级等考试中真实出现过的句子（如真题、TPO，剑桥系列）进行结构化分析，可以有效提升句子理解的准确性和效率。朗播通过近百万的用户实际数据分析发现，练习 300-400 个句子，会让阅读能力有显著提升。请按顺序阅读句子，并思考：
1. 句子属于哪种结构类型？简单句？并列复合句？主从复合句？
2. 句子由哪些子句构成，连接这些子句的关联词是什么？
3. 每个子句中各个语法成分分别是哪些？
4. 句子的中文意思是什么？
1. 句子属于哪种结构类型？简单句？并列复合句？主从复合句？
2. 句子由哪些子句构成，连接这些子句的关联词是什么？
3. 每个子句中各个语法成分分别是哪些？
4. 句子的中文意思是什么？
1. 主从复合句
2. 原句中的各个子句，子句类型以及连接词
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主句It has been estimated something.子句类型:主句连接词:
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分句-1An additional one-fourth of the Earth's land surface is threatened by this process.子句类型:主语从句连接词: THAT
3. 句子成分
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主句It [形式主语] has been estimated [谓语] something.[主语]
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分句-1An additional one-fourth of the Earth's [定语] land surface [主语] is threatened [谓语] by this process. [状语]
4. 句子翻译
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主句It has been estimated something.一件事被估计。
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分句-1An additional one-fourth of the Earth's land surface is threatened by this process.地球陆地表面另外四分之一的地方也正在受到沙漠化的威胁。
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全句It has been estimated that an additional one-fourth of the Earth's land surface is threatened by this process.据估计，地球陆地表面另外四分之一的地方正在受到沙漠化的威胁。
考点解析
根据朗播专家权威分析，句子“It has been estimated that an additional one-fourth of the Earth's land surface is threatened by this process. 英语长难句解析 ”主要针对以下知识点进行考查，关于这些知识点的讲解如下：
主从复合句
含有两套或更多的主谓结构，其中有一个是主要的主谓结构，其他主谓结构从属于它并且担任起句子成分。
①They believe that the computer will finally take the place of human beings.
②He asked me where he could get such medicine.
主句
主从复合句中的主干句子，能单独使用或出现的句子。
①They believe that the computer will finally take the place of human beings.
②He asked me where he could get such medicine.
主语从句
在主从复合句中充当主语的句子是主语从句。
①It is certain that he will win the match.
②What caused the accident remains unknown.
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