1. By 1989, almost every nation on earth had established a program educating its people about AIDS, according to Jonathan Mann, director of the World Health Organization's (WHO) International Program on AIDS.
    据世界卫生组织国际艾滋病项目主任乔纳森·曼说，到1989年几乎每个国家都制订了对公民进行艾滋病教育的计划。

2. After the war, a character called Uncle Sam began appearing in political cartoons, his form evolving from an earlier cartoon character called Brother Jonathan that was popular during the American Revolution.
    战后，政治漫画里开始出现了一个名叫"山姆大叔"的人物。他的原型是一个早期漫画人物，名叫乔纳森大哥，此人在美国独立战争时期非常出名。

3. Uncle Sam soon replaced Brother Jonathan as American's most popular symbol.
    很快，山姆大叔就取代了乔纳森大哥，成了最受美国人欢迎的象征。