这个句子（雅思阅读例句）结构剖析是不是正确，请大神之指正。
For example, one graphic illustration to which children might readily relateis the estimate that rainforestsare being destroyed at a rate equivalent to one thousand football fields every forty minutes - about the duration of a normal classroom period。
（1）For example 状语。
（2）one graphic illustration to which children might readily relateis the estimate 是which做关系代词的定语从句（原句应该是主语从句that children mightreadily relate to one graphic illustration is the estimate 为了先说重点所以变成了定语从句）。
（3）that rainforests are being destroyed at a rate equivalentto one thousand football fields every forty minutes 是the estimate的定语从句，every forty minutes做状语。
（4）about the duration of a normal classroom period是every forty minutes的同位语/插入语
你的理解部分正确，部分有误。one graphic illustration 是主语，to which 引导后面的定语从句， is 是系动词，estimate是表语，that 引导同位语从句。其他剖析基本争取。不过，你如此学雅思效率太低了。能准确理解句子意思非常重要，纠结句子成分不必。多做题，扩大词语量。假如你基础太差，需要看一本语法书。高中水平语法即可。
