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
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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