China has targeted the coastal city of Dalian as a high-tech innovation hub. AFP/Getty Images hide caption

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Citrus worker Audra Wilson packs oranges for customer orders Monday in Clermont, Fla. The fruit was picked before the freeze, but the grove owner estimates a 30 to 50 percent loss of the fruit still on the trees. John Raoux/AP hide caption

itoggle caption John Raoux/AP