apriori knowledge meaning in English

先验知识, 验前知识

In this tutorial three artificial sets of elements will be used : lowercase , uppercase ve xnumber sets . for a human reader it is an easy task to recognize the set an element belongs to . but the computer does not have the apriori knowledge the human has and so the logic would have to be programmed into the handling program
在本教程中,我们假定3个元素集合:小写字母,大写字母,以x开头的数字ve xnumber ,尽管对于人类来说可以很容易的识别一个元素是属于哪个集合,然而计算机并没有人类这种演绎能力,因此这样的逻辑必须要编写到处理程序里去