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　　● 题目：

　　An important principle is that all corpora, whatever their size, are inevitably limited in their coverage, and always need to be supplemented by data derived from the intuitions of native speakers of the language, through either introspection or experimentation. (test3 passage 3)

　　● 分析：

　　本句主句为“An important principle is…”;“that all corpora, whatever their size, are inevitably limited in their coverage, and always need to be supplemented by data derived from the intuitions of native speakers of the language, through either introspection or experimentation.”为that引导的表语从句，做is的表语;“whatever their size”为whatever引导的状语从句，在表语从句中做让步状语;“derived from the intuitions of native speakers of the language”为过去分词短语做定语，做data的定语。