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Quora是一个问答SNS网站，被称为美版知乎，Quora由Facebook前雇员查理-切沃（Charlie Cheever）和亚当-安捷罗（Adam D’ Angelo）于2009年6月创办。

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TED Talks are influential videos from expert speakers on education, business, science, tech and creativity, with subtitles in 100+ languages. Ideas free to stream and download.

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