52岁的凯斯及其50岁的妻子吉恩•凯斯(Jean Case)说，他们之所以签署誓言书，是因为他们希望这样有助于慈善家们相互学习。凯斯说，重要的不是支票的数额，而是结果。

Ms. Case said Internet entrepreneurs have a unique interest in philanthropy. 'The folks that helped bring AOL to life were out to change the world,' she said. 'It seems a natural thing that as they look at the role they want to play, they are giving back in big ways.'

吉恩•凯斯说，互联网创业家对慈善事业拥有独特的兴趣。她说，那些帮助美国在线起死回生的人们要改变世界去了；当他们即将发挥他们想发挥的作用时，他们是在大规模地回馈社会，这似乎是一件很自然的事情。

Messrs. Icahn and Zuckerberg weren't available to comment. In a video prepared by the Giving Pledge, Mr. Zuckerberg said, 'There's so much that needs to be done, it would be better to start now.'

记者未能联系到伊坎夫妇和扎克伯格置评。扎克伯格在“捐赠誓言”制作的一个视频里说，需要做的事情太多，最好是从现在就开始。

Starting last year, Mr. Gates, his wife Melinda Gates, Mr. Buffett and other wealthy individuals hosted a series of dinners for billionaires to discuss setting up the pledge. That led to an announcement in June of the pledge and its earliest signers.

从去年开始，盖茨、盖茨妻子梅琳达•盖茨(Melinda Gates)、巴菲特和其他富人主持一系列晚宴招待亿万富豪，讨论发起捐赠誓言的事情。讨论的结果是在今年6月份公布了誓言书及其最早的一批签署人。

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