Byrd and his men were able to take a great many photographs of the mountains that lay below上面句子最后的that lay below,是定语从句?怎么理解它?

问题描述:

Byrd and his men were able to take a great many photographs of the mountains that lay below
上面句子最后的that lay below,是定语从句?
怎么理解它?

修饰the mountains, 指的是匍匐在下的山脉

应该是that引导的定语从句,用来修饰the mountains,你可以这样理解,##可以他们脚底下的山拍很多的照片.