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（单词翻译）
US drought pushes up food prices
Vocabulary
drought
long period of dry weather leading to water shortages
withered
dried out and shrivelled
staple crops
most important foods
irrigated
watered by using pipes, ditches and streams
a bumper year
a larger than usual period of growing
projections
estimates or forecasts
exports
sent to other countries
dramatically
in a big way
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