No one can alter the fact, ex post facto.
没有人能在事后改变事实本身。
His confession of ignorance of French is, ipso facto, a confession of unfitness for his present office.
他承认不懂法文，事实上就等于承认不适合担任他现在的职务。
He is an outstanding pupil and, ipso facto, dislike by the rest of the class.
他是优秀的学生，正因为这个缘故，全班都不喜欢他。
