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Helicopters practice acrobatic moves for expo

(chinadaily.com.cn) Updated: 2013-09-05 21:47
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Helicopters practice acrobatic moves for expo

Visitors watch an air show during the Second 皇冠体育app Helicopter Exposition in the northern city of Tianjin, Sept 5, 2013. The exposition kicked off on Thursday. [Photo/Xinhua]

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