在两次的研究中，Missouri大学的Marsha Richins仔细调查了实利主义和过度使用信用卡的关系。
In two studies, Marsha Richins of the University of Missouri examines the relationship between materialism and credit overuse.
这两次研究基于不同国家：只有秘鲁，赞比亚和越南同时在两项研究中出现。
The two studies are based on different sets of countries: only Peru, Zambia and Vietnam appear in both.
研究人员在七至九个月时间里，每天两次，每次一小时，让这些正常的和患老年痴呆症的啮齿动物接触由标准手机产生的电磁场。
Both the normal rodents and those with Alzheimer's were exposed to the electromagnetic field generated by standard mobiles use for two one-hour periods each day for seven to nine months.
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