I visited the beautiful leaning tower, which is eight floors high, each having a round of columns, rising one above another.
我参观了美丽的斜塔,它有八层楼高,每一层都有一个圆柱,一个接一个。
【1】主句:I visited the beautiful leaning tower.
【2】定语从句:which is eight floors high
备注:关系代词which引导非限制性定语从句,which指代leaning tower,并在定语从句作主语。
【3】状语:each having a round of columns, rising one above another.
备注: each having...为代词+现在分词构成独立主格结构作状语。