index species,indicator species是什么意思

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• 几个高三英语翻译及相关问题Altogether the group of islands formed a little world within itself. 请翻译一下Darwin first understood the development of different plant species from development in bird species that he observed in Galapagos.请问本句什么意思?“the development of different plant species from development in bird species that he observed ”分析一下结构The influence of the environment was behind the development of new species.“ behind the development of new species.”是什么意思It wo
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• 单复数同行的词都是集体名词吗?The species is[are] valuable.这一物种很珍贵.比如前面这句,species是单复数同行的词,这里为什么可以用is和are各代表什么意思啊?
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