Hotels taking subscriptions can list their specials for free for a limited time, but in the future TripAdvisor likely will charge for them, upping the revenue stream some more.

申请酒店信息列表服务的酒店可以在一定期限内免费发布酒店优惠信息，但未来TripAdvisor应该会对这项服务进行收费，从而增加更多的收入来源。

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For a limited time V1: Agile Team is available for free for an unlimited number of users.

在某个时间范围内，“V 1：敏捷团队”的用户数量不会受到限制。

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Bundles only last for a limited time, but come free of digital rights management (DRM) restrictions.

游戏包限时供应，但不受数字版权管理(DRM)限制。

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Promise's Billy Harrison gave us a walkthrough of the highlights including a live demonstration of the free (for a limited time) SmartStor Fusion Stream app running on an iPad (and soon Android and Windows Phone 7 devices).

ENGADGET: Promise's SmartStor Zero NAS streamer dumbs down DLNA for the iPad (hands-on)

New users will be able to test the service for a limited time period for free, and it will be included for all existing Spotify Premium users with a compatible Samsung internet-connected Smart TV.

ENGADGET: Samsung partners with Spotify, brings streaming music to its 2012 Smart TVs in Europe

This workaround relies on the fact that Microsoft is currently offering, for a time limited period, free upgrades for the Media Center add-on, and it is this process that is flawed because Microsoft does not check the validity of the original key used to activate the copy of Windows 8 Pro before dishing out another key.

FORBES: Microsoft Blunder Gives Pirates Free Copies Of Windows 8 Pro