The second stage of this experiment took place four months later when the participants were contacted by a different experimenter apparently about a different study - of course this was just a ruse.

实验的第二阶段发生在四个月之后，这些被试被不同的实验者联系，为了防止被试受第一个实验的干扰，他们被告知这是不同的实验。

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At least that was the finding of a study carried out by Mirjam Tuk, a professor at the University of Twente in the Netherlands. In an experiment, Tuk tested two sets of participants.

荷兰屯特大学教授Mirjam Tuk做了个研究，实验中，Tuk把参加测试的人分成两组。

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In a study using monkeys, the experiment was set up so that two monkeys obtained food by cooperating with each other.

有一个用猴子做的研究，实验的设置，使得两只猴子必须互相协作才能取得食物。

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