求大神英语句子分析For taxonomy,or classification,long series,from a s
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?