写文章时如何引用参考文献啊，比如想引用看到的文献中一句话，而这句话在该文中也是带参考文献的，例如：It is well known that the photocatalytic activity strongly dependon the better adsorption of organic substrate and the improvementof the interfacial charge transfer reaction [27,28]，如果想用这句，我是引用[27,28]，还是该篇文献？
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