客户制定出他们愿意为Spot实例每小时支付多少钱，只要Spot的价格仍然低于客户给出的阈值，Spot实例就会一直运行。
Customers define at which price per hour they are willing to pay for Spot instances, and as long as the Spot price remains below the customer's threshold, the Spot instances execute.
出版商决定是否授权amazon(或任何一个其它电子阅读器厂商)出版他们的图书。如果Amazon给出的价格减少了他的利润，他就会拒绝。
The publisher decides whether to license Amazon (or any other producer of an electronic reader) to publish his book, and can refuse if the price Amazon offers him will decrease his profits.
他们所给出的价钱介于三种酒的“真正”价格之间，而不是介于两次品尝同一种酒的价位间。
The volunteers reported differences between the three "real" wines but not between the same wines when served twice.
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