英语句子结构解析句子是：Life'stransitionfromtheseatothelandwasperhapsasmuchofanevolutionarychallengeaswasthegenesisoflife.我知道Life'stransitionfromtheseatotheland是主语,was后面应该跟一个句子,

Question

英语句子结构解析
句子是：Life's transition from the sea to the land was perhaps as much of an evolutionary challenge as was the genesis of life.

我知道Life's transition from the sea to the land 是主语,was后面应该跟一个句子,而perhaps后面也是应该引导一个句子的.
但是was the genesis of life不是个完整的句子啊,加上as……as的修饰也不是啊?
所以这个句子结构是怎么回事?
谢谢大家的帮忙啦!

Answer 1

第二个as 引导定语从句,先行词是an evolutionary challenge ,as 在从句中充当主语.
整句话意思为,
生命从海洋过度到陆地,其进化挑战不亚于生命的起源.
定语从句的关系词除了常见的that,which 等等,还有such,as,平时遇到了,多积累就好了.