One idea to seriously avoid: giving users say, a 30-day limited-time free trial.

其中之一要杜绝的是这样的点子：用户可免费试用本产品30天。

Its limited-time sales start at noon each day and sell out quickly, so people miss out if they are away from their computers.

他的限时销售在每天中午开始然后很快卖光，无偶一人们一旦离开电脑就会错失良机。

Shangpin launched in July 2010, and offers top European labels, such as Gucci, to Chinese consumers during limited-time online sales.

尚品网2010年7月面世，主要面向中国消费者进行欧洲顶级奢侈品品牌(如Gucci等)的限时在线销售。

Companies, especially those pitching limited-time offers, should first mail out those promotions to consumers with surnames that fall deeper in the alphabet.

一些公司，特别是那些短期打折促销的公司，他们首先会向姓氏首字母靠后的消费者发出促销信息。

The fire engine can carry extra tanks or refilling equipment, and a firefighter spends a limited time in the burning building.

消防车可以装载额外的气瓶或者充气设备，而消防员在着火建筑内停留时间也有限。