英语翻译Though,at first,Byrd and his men were able to take a gre

英语翻译
Though,at first,Byrd and his men were able to take a great many photographs of the mountains that lay below,they soon ran into serious trouble.
请从从句的角度分析一下that lay below

Though,at first,Byrd and his men were able to take a great many photographs of the mountains that lay below,they soon ran into serious trouble.
虽然一开始,Byrd和他的人可以拍摄到位于下面的这些大山的照片,但他们很快就陷入困境.
lay below 位于...下面
这里是定语从句
mountains that lay below
that lay below修饰mountains,mountains在从句中做主语,山位于下面
run into trouble陷入困境