The researchers g**e 14 healthy volunteers either green tea, diluted caffeine or hot water and then measured the function of endothelial cells lining the circulatory system.

• 研究人员让14名身体健康的志愿者分别饮用绿茶、稀释的咖啡和热水，然后对他们的循环系统内皮细胞的机能进行检测。