"I used to be a tea drinker before I came here," she said, "Many people around me are coffee drinkers."
“来这里之前，我喜欢喝茶，”她说，“我周围很多人都喜欢喝咖啡。”
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The researchers’ work began two years ago when Dr Misra, a heavy coffeedrinker, left a cup unfinished and noticed the next day that the coffee was covered by a film of oil.