Several hundred miles eastward from Florida there is a part of the ocean called the Sargasso Sea
问题描述：
Several hundred miles eastward from Florida there is a part of the ocean called the Sargasso Sea
进行语法分析
there引导的从句和Several hundred miles eastward from Florida是什么关系
答
翻译：从佛罗里达向东几百英里,有一片叫马尾藻海的海洋.
Several hundred miles eastward from Floridas是地点状语啊,说明海洋的位置；
there is a part of the ocean called the Sargasso Sea 不是从句,就是there be结构表存在,这是句子的主干.called the Sargasso Sea 做ocean的后置定语.
再举一例：Three hundred miles from here, there is a mountain.
明白了没,不懂再追问》》》
祝学习进步!