But when the Aswan dams were constructed in the 20th century to provide electricity and irrigation, and to protect the huge population centre of Cairo 英语长难句解析

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句子

But when the Aswan dams were constructed in the 20th century to provide electricity and irrigation, and to protect the huge population centre of Cairo and its surrounding areas from annual flooding and drought, most of the sediment with its natural fertilizer accumulated up above the dam in the southern, upstream half of Lake Nasser, instead of passing down to the delta.

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？

学会分析长难句 ----> 上朗播网答案

1. 主从复合句

2. 原句中的各个子句，子句类型以及连接词

主句

But most of the sediment with its natural fertilizer accumulated up above the dam in the southern, upstream half of Lake Nasser, instead of passing down to the delta.

子句类型:

主句

连接词:
分句-1

The Aswan dams were constructed in the 20th century to provide electricity and irrigation, and to protect the huge population centre of Cairo and its surrounding areas from annual flooding and drought.

子句类型:

状语从句

连接词: WHEN

3. 句子成分

主句

But [连接词] most of the sediment [主语] with its natural fertilizer [定语] accumulated up [谓语] above the dam [状语] in the southern, upstream half of Lake Nasser, [状语] instead of passing down to the delta. [状语]
分句-1

The Aswan dams [主语] were constructed [谓语] in the 20th century [状语] to provide electricity and irrigation, [状语] and [连接词] to protect the huge population centre of Cairo and its surrounding areas from annual flooding and drought. [状语]

4. 句子翻译

主句

But most of the sediment with its natural fertilizer accumulated up above the dam in the southern, upstream half of Lake Nasser, instead of passing down to the delta.

但是，在纳赛尔湖南面、中上游，大多数带有天然肥料的沉积物在大坝上面累积了起来，而不是往下流入三角洲。
分句-1

The Aswan dams were constructed in the 20th century to provide electricity and irrigation, and to protect the huge population centre of Cairo and its surrounding areas from annual flooding and drought.

为了供电和灌溉，为了保护密集的人口中心开罗和它周围地区每年不遭受洪灾和干旱，阿斯旺大坝在二十世纪建了起来。
全句

But when the Aswan dams were constructed in the 20th century to provide electricity and irrigation, and to protect the huge population centre of Cairo and its surrounding areas from annual flooding and drought, most of the sediment with its natural fertilizer accumulated up above the dam in the southern, upstream half of Lake Nasser, instead of passing down to the delta.

但是为了供电和灌溉，为了保护密集的人口中心开罗和它周围地区每年不遭受洪灾和干旱，阿斯旺大坝在二十世纪建了起来，此后，多数带有天然肥料的沉积物在大坝上面累积了起来（大坝处于纳赛尔湖南面、中上游），而不是往下流入三角洲。

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考点解析

根据朗播专家权威分析，句子“But when the Aswan dams were constructed in the 20th century to provide electricity and irrigation, and to protect the huge population centre of Cairo 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：