从网上或笑话书上选取三到四个真正能让你发笑的笑话。

Choose three or four jokes that really tickled you from the Internet or a joke book.

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这五位教授在研究中调查了约4,000名美国人，询问他们前一天做了什么，然后就其中随机选取的三件事询问详情。

For the study, the five professors surveyed some 4, 000 Americans, asking what they did the previous day and then quizzing them in detail about three randomly selected events from the day.

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例如，清单3显示了一个定制规则集，它从三个内置规则集中选取了11个特定的规则。

For example, Listing 3 shows a custom rule set that selects 11 specific rules from three of the built-in sets.

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