Visitors view an old model of Royal Australian Airforce aircraft during the Canberra Airport Open Day in Canberra, Australia, on April 8, 2018. (Xinhua/Zhu Nan)
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Visitors view an old model of Royal Australian Airforce aircraft during the Canberra Airport Open Day in Canberra, Australia, on April 8, 2018. (Xinhua/Zhu Nan)
