People walk through the gate of giant pandas pavilion at the Zoo Aquarium in Madrid, Spain, March 22, 2018. The year of 2018 is the 40th anniversary of the first arrival of Chinese giant pandas to Spain. (Xinhua/Guo Qiuda)
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People walk through the gate of giant pandas pavilion at the Zoo Aquarium in Madrid, Spain, March 22, 2018. The year of 2018 is the 40th anniversary of the first arrival of Chinese giant pandas to Spain. (Xinhua/Guo Qiuda)