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A visitor tries MR (Mixed reality) devices at the booth of Haier at Hanover Fair 2019 in Hanover, Germany, April 1, 2019. (Xinhua/Shan Yuqi)

A visitor tries MR (Mixed reality) devices at the booth of Haier at Hanover Fair 2019 in Hanover, Germany, April 1, 2019. (Xinhua/Shan Yuqi)