句子成分分析

This is a long descent—roughly 20 miles down a beautiful valley to the little village below.

请问一下这里down和to介词是作什么成分？谢谢老师！

This is a long descent—roughly 20 miles down a beautiful valley to the little village below.

这里，破折号跟逗号作用相同，用破折号为了醒目。

This is a long descent, roughly 20 miles down a beautiful valley to the little village below. =

This is a long descent, which is roughly 20 miles down a beautiful valley to the little village below.

破折号部分，作非限制性定语，作用上相当于一个非限制性定语从句。

down a beautiful valley to the little village below

都是介词。down 沿着，to 通向。down...to...两个介词短语合在一起，可以看作 20 miles 的定语。

新课标英语课本有一个句子很相似：

It makes wide bends or meanders through low valleys to the plains where rice grows. At last, the river delta enters the South China Sea.

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曹荣禄 1秒前

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—roughly 20 miles down a beautiful valley to the little village below

破折号提示后面是补充语supplement，对descent（下坡路）作补充说明。

roughly 20 miles距离 down a beautiful valley途径 to the little village below目的地/终点。