请帮忙分析这句的语法（英语）Most of us thought the sand had come form an ancient mountain range fairly close by that flattened out over time.这句中,fairly close by 是修饰 mountain range对吗?那么,后面那个that从句是修饰

请帮忙分析这句的语法（英语）Most of us thought the sand had come form an ancient mountain range fairly close by that flattened out over time.这句中,fairly close by 是修饰 mountain range对吗?那么,后面那个that从句是修饰
请帮忙分析这句的语法（英语）
Most of us thought the sand had come form an ancient mountain range fairly close by that flattened out over time.
这句中,fairly close by 是修饰 mountain range对吗?那么,后面那个that从句是修饰谁呢?或者是,close by that 本身就是连在一起的?我迷糊了!英语达人请帮忙分析这句话的精确语法.

请帮忙分析这句的语法（英语）Most of us thought the sand had come form an ancient mountain range fairly close by that flattened out over time.这句中,fairly close by 是修饰 mountain range对吗?那么,后面那个that从句是修饰
fairly close by 是修饰 mountain range 指 附近的山脉
that flattened out over time.也是修饰mountain range 山被岁月抹掉成沙
我们大都认为沙子是 临近的山脉长时间被风化造成的

an ancient mountain range fairly close by 可以这样解释：mountain的表层，就是
山脉的表层， 砂子来自于山脉的表层风化（flatten out,表层变平）

主语Most of us
谓语thought
从句中的主语the sand
从句中的谓语had come form
从句中的宾语an ancient mountain range
fairly close by修饰had come for
that flattened out over time.是修饰an ancient mountain ran...

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主语Most of us
谓语thought
从句中的主语the sand
从句中的谓语had come form
从句中的宾语an ancient mountain range
fairly close by修饰had come for
that flattened out over time.是修饰an ancient mountain range的定语从句
可以转换成下面这样
Most of us thought the sand had come form fairly close by an ancient mountain range that flattened out over time.

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