You take a six to eight cell embryo, you tease out one of the cells, you run a genetic test on that cell, and depending on the results of that test you either implant that embryo or you discard it.
一个6-8细胞胚胎， 你从中取出一个细胞，对它进行基因测试， 依照测试的结果， 你选择植入这个胚胎或者丢弃它。