This amazing picture shows a rare phenomenon called a roll cloud which tend to form ahead of a cold front and can stretch for miles.

这张惊人的图片展示了一种叫做云卷的罕见现象，它往往形成于冷锋之前，并能延伸数英里远。

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With applications freed from legacy server environments, cloud-based collaboration platforms can more easily roll out mobile app versions of enterprise apps, while also adding in hooks for various types of social networking.

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The space of cloud services is quite different from the landscape of traditional hosting and roll-your-own data centers.

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Last week, the firm launched the official roll-up of their recent acquisitions of Buddy Media and Radian6 into an offering called Marketing Cloud.

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