pass down：传承pass down通常用于被动语态，即be passed down，可以用介词to引出具体对象。
例句：Patriotism should bepassed downfrom generation to generation.爱国主义精神应该世代传承。pay off 尤指还清债务Pay somebody off: 付清,偿还某人. 如：I can pay you off next month. 我下个月可以付清给你。Pay off: 创造收益。如： My investment in those stocks has really paid off. 我在股票上的投资已经有收益了
