求大神英语句子分析

题目

求大神英语句子分析
For taxonomy,or classification,long series,from a single nest,which contain all castes are desirable,to allow the determination of variation within species.请哪位大神分析一下这个句子'''long series在这是主语嘛?是什么含义?are desirable 为啥不是放在within species后作主语的系表结构?

答案

这句话的主谓宾是long series are desirable to allow the determination of variation within species.long series 得从文章中来看是什么意思了,within species 定语,修饰the determination...