Constance Ruhl, who helped lead the study. Writing in the American Gastroenterological Association journal Gastroenterology, Ruhl and colleagues said caffeine seemed to hold the key.
鲁尔及其同仁在美国胃肠病学会的《胃肠病学》期刊撰文表示，咖啡因可能是造成这种效果的主因。
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The consumption growth was led by an expansion of the U. S. industrial sector as the world's top economy emerged from the 2008 financial crisis, BP Chief Economist Christof Ruhl said.