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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2007年VOA标准英语（九月）

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absorbed dose distribution

alphanumeric(character)

Angeleno

angle modulstion

be short with someone

blue rinses

Brazilian arrowroot

break a fly upon the wheel

bronzed

cabasset

carotid disease