"Engineering formula" contest of International Army games 2019 held in Tyumen, Russia

People watch the competition during "Engineering formula" contest of the International Army games 2019 in Tyumen, Russia, Aug. 10, 2019. The International Army Games 2019 runs from Aug. 3 to 17. (Xinhua/Evgeny Sinitsyn)

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Source:Xinhuanet
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