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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

Two helicopters stage a show during the Second 皇冠体育app Helicopter Exposition in the northern city of Tianjin, Sept 5, 2013. [Photo/Asianewsphoto]

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