谁能帮忙详细分析下这句话,包括其结构和意思.That is why, in a famous passage, he defends the study of the 'lower' animals and how they work as being as worthy a human study as the grander stury of the heavenly bodies.
问题描述：
谁能帮忙详细分析下这句话,包括其结构和意思.
That is why, in a famous passage, he defends the study of the 'lower' animals and how they work as being as worthy a human study as the grander stury of the heavenly bodies.
答
这是主系表结构，that is 是主语和系动词，why he defends the study....是表语从句。其中in a famous passage,是插入语。as...as...是状语，表示比较。
这正是他为低等级生物以及其行为研究辩护的原因所在。真如他在一篇著名的文章中（所说），他认为这种研究与研究宏大的天体一样有价值。
答
That is why,in a famous passage,he defends the study of the 'lower' animals and how they work as being as worthy a human study as the grander stury of the heavenly bodies.主语：That （那）系动词：is ...