from a general law to a particular instance

from a general law to a particular instance是何意原文：a priori，《兰登屋韦氏大学英语词典》，这样解释：1）、from a general law to a particular instance;valid independently of observation.2)、existing in the mind independent of experience.3)、conceived beforehand.

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从一般法律对一个特殊事例??? ???a priori????????????????????1??from 一般法律对一特殊instance;valid 独立观察。2)?existing 在头脑里独立经验。3)?conceived 予先。