Google Sites is tightly integrated with other Google products such as Picasa, Spreadsheet, Document, Presentation, etc.

Google Sites与Google的其它产品，例如picasa，电子表格，文档，演示等紧密结合。

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Google Picasa has features and options that are not explained anywhere!

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Google acquired Picasa in 2004.

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Photo services from Yahoo's Flickr to Google's Picasa already existed.

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