联想免费使用享誉全球的IBM商标的期限为2010年，之后必须换用自己的认同度较低的商标。

Lenovo only has until 2010 to make free use of the trusted IBM name, before having to switch to its own, less esteemed label.

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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。

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.

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如果你从亚马逊上买一张MP3专辑，5GB将免费升级为20GB，期限1年。

If you buy one album from Amazon MP3, they’ll upgrade your Cloud Drive storage to 20 GB for free for a year — another nice perk.

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