Then, on the last two days of the study, they could choose what they ate.

然后，在这项研究的最后两天里，他们可以选择他们吃什么。

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In the new study, 47 volunteers were given two brain scans, each on different days.

在这项新的研究中，47个志愿受试者接受了两次脑扫描，每次扫描的时间不同。

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British Internet users spend an average of two days a month surfing the web aimlessly, or "wilfing" as the activity has been dubbed, according to a study released on Tuesday.

本周二公布的一项调查显示，英国网民每月平均有两天的时间在网上漫无目的的閒逛，这种行为被授予了一个新名词--“网游”(wilfing)。

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Then, on the last two days of the study, they could choose what they ate.

CNN: Sleep deprivation spurs hunger

To do this they went back to the beginning and compared diagnoses between the two groups on a daily basis for each of the 122 days of the study.

ECONOMIST: Epidemiology: Infectious personalities | The