And Joseph knows that it would decimate his father Jacob to lose Rachel's only remaining son, but he's testing his brothers to see whether they have reformed since the day that they sold him into slavery.

约瑟夫知道这将打击他父亲雅各布,如果失去Rachel唯一剩下的儿子，但他只想考验兄弟看他们是否改过自新,在他们把他变卖为奴之后。

耶鲁公开课 - 旧约导论课程节选