的一大贡献就是2011世界艾滋病日这一专题。
S contribution, among many, is our World AIDS Day 2011 section.
西班牙潘普洛纳，一名游客走过世界艾滋病日展览厅。
A visitor walks past a World AIDS Day exhibition in Pamplona, Spain.
我认为今年世界艾滋病日选定的主题清楚表明了这些挑战。
I believe that the theme selected for this year's World AIDS Day captures these challenges well.
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