This is Scientific Americans 60-Second Science. Im Karen Hopkin. This will just take a minute. In 2005 two scientists won a Nobel Prize for discovering that a bacterium called Helicobacter pylori causes most stomach ulcers. One of them even chugged a

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面试英语

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外研社新标准高中英语选修9

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美国习惯用语

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英语新闻

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