The idea, announced just six weeks ago as "The Giving Pledge, " was thought up by Gates and Buffett to convince billionaires to give most of their money -- 50 percent or more -- to charity.

这项叫做“给予的誓言”的活动是6周前比尔盖茨和巴菲特为了说服亿万富翁们捐出财产而想出来的。