Only at night, after the sun has set below the desert horizon and the smell of grilled camel drifts out of the sandwich shops that dot the broad boulevards, does the city come to life.

只有在夜晚，落日淹没天际，面包房里传来烤骆驼的香味，遍布大街小巷，这座城市才显露出活力。

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This time a new set of participants, who were university students, were asked if they would be willing to walk around their campus for 30 minutes wearing a sandwich board saying: "Eat at Joe's".

这次来了一批新的被试，他们都是大学生。实验者问他们是否愿意挂上写着“来Joes饭店吃饭”的广告牌在校园里闲逛30分钟。

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