Margaret spent over an hour looking at cards, but she could not find the cards that were right.

玛格丽特花了一个多小时看卡片，但她找不到适合的卡片。

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Half an hour later they were asked to recall the position of the CARDS from the original task.

半个小时后，所有人被要求回忆最初任务中卡片的位置。

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Most will be happy simply to finish the gruelling event, but for elite athletes a world record is on the CARDS, though not perhaps the magic two-hour barrier.

其中的大部分对于能跑完这筋疲力尽的比赛就很高兴了；但是对于运动健儿而言，他们也许可以打破世界纪录；可惜，这个纪录不太可能跨越2个小时这个奇迹。

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Consumer-facing firms have developed a wide variety of price discrimination schemes involving coupons, volume discounts, memberships, reward cards, happy hour specials, and so forth.

FORBES: Haggling, Social Norms, and Economic Efficiency

Three-time World Memory Champion Ben Pridmore invented a memory system, which he alone has mastered, that allowed him to memorize the precise order of 28 shuffled packs of playing cards in one hour.

CNN: How to train your mind to remember anything

Even while paying off the loan with scratch cards, users pay half as much for each hour of lighting as they did with kerosene.

ECONOMIST: Solar lighting