2012年12月大学英语六级考试阅读疑难杂句8
President Bush campaigned to move Social Security to a saving-account model, with retirees trading much or all of their guaranteed payments for payments depending on investment returns.
【词汇突破】 campaigned to do 致力于. (写作替换词：devote to，focus on, dedicate oneself to)
social Security 社会保障
saving-account model 账户储蓄模式(如果不能准确的理解这个词的意思，提取主干时去掉它也不会有影响，只要理解是一种模式就好。)
trade 交换
guaranteed 保障，确保
swear to , guarant to , assure to 都是保障和确保的意思。
