then的反义词是:priorI have already made a prior appointment with my dentist.我之前就已经跟我的牙医预约好了。

Supporting one's elderly parents is prior to all others for an adult.赡养自己年老的父母是成年人最重要的责任。The police found out that the thief had priors.警察查出这个小偷有前科。The course required no prior knowledge of Korean.这门课程不需要事先学过韩语。