used when an extra short message is added to the end of a letter after a message has already been added再附言,第二次附言
PS I forgot to invite you to our party next Sunday at six. PPS Please tell Ellis that he's welcome to come too.附言:我忘了邀请你来参加下星期日6点的晚会了。再附言:请告诉埃利斯,也欢迎他来。