The survey looked at consumption of coffee, tea, chocolate, sodas, energy drinks and caffeine pills in 20 major cities in the United States by interviewing 2, 000 people.
该项在美国20个主要城市开展的调查共有两千人参加，主要针对咖啡、茶、巧克力、苏打水、能量饮品及咖啡因片剂在这些城市的消费情况进行了访问。
The survey looked at consumption of coffee, tea, chocolate, sodas, energy drinks and caffeine pills in 20 major cities in the United States by interviewing 2,000 people.
该项在美国20个主要城市开展的调查共有两千人参加， 主要针对咖啡、茶、巧克力、苏打水、能量饮品及咖啡因片剂在这些城市的消费情况进行了访问。
To control the amount of caffeine the participants received, the team gave them pills containing caffeine equivalent to around four cups of coffee in one day or similar looking placebos.
为了控制参与者的咖啡因吸收量，研究组给他们含有大约相当于一天四杯咖啡的咖啡因药片，或者外表相似的安慰剂药片。
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