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于1665年用自制显微镜首次观察到细胞的科学家是
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Chomsky defines“competence” as the ideal user's () of the rules of his language.
Language is distinguished from traffic lights in that the former has the designing feature of ().
In linguistics research, both () and () approaches are preferred.
Language is a means of verbal communication. It is () in that communicating by speaking or writing is a purposeful act.
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