There are paid, free, and ad-supported versions, seasonal and non-seasonal updates.

Rovio提供了付费版、免费版、内置广告版以及时令版和非时令版更新。

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That's because at the same time, Microsoft will also offer free, ad-supported Web versions of Office applications.

那是因为与此同时，微软将提供免费的，支持广告的web版本的office应用。

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Since I am experimenting with the iOS 5 beta I also had the iTunes 10.5 ad Xcode 4.2 beta versions installed on my system.

由于我参加了iOS 5 beta版的实验，因此我的操作系统上还安装了iTunes 10.5和Xcode 4.2的beta版。

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Then there is the process of automatic ad optimization where many versions of a single ad get pitted against each other in search of the one that gets clicked the most.

FORBES: Why Banner Ads Aren't More Lovable

And Ohio Art seized on the publicity, creating a politically themed ad campaign and manufacturing blue versions of the famously red toy.

WSJ: Etch A Sketch Inventor Dies at 86

Numerous versions of the ad all pointed to letsdothis.com, where people could compete in a series of small games to earn badges and prizes, including a Sonic giveaway.

FORBES: The Super Bowl ad show: Was the return on investment worth it?