23考研英语长难句分析每日一句|【第五十六句】

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The overall result has been to make entrance to professional geological journals harder for amateurs, a result that has been reinforced by the widespread introduction of refereeing, first by national journals in the nineteenth century and then by several local geological journals in the twentieth century.

名词短语a result...是同位语，对The overall result进行解释说明，that引导定语从句，修饰result。介词短语by the widespread introduction of refereeing作状语，first by...and then by...是并列的后置定语，修饰introduction of refereeing。

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