A staff member adjusts a mask-making machine at an exhibition area during the 28th Guangzhou Fair in Guangzhou, south China's Guangdong Province, Aug. 28, 2020. The four-day Guangzhou Fair kicked off here on Friday. (Xinhua/Deng Hua)

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Photo taken on Aug. 28, 2020 shows an unmanned vehicle during the 28th Guangzhou Fair in Guangzhou, south China's Guangdong Province. The four-day Guangzhou Fair kicked off here on Friday. (Xinhua/Deng Hua)

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People visit an agriculture products booth during the 28th Guangzhou Fair in Guangzhou, south China's Guangdong Province, Aug. 28, 2020. The four-day Guangzhou Fair kicked off here on Friday. (Xinhua/Deng Hua)

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Photo taken on Aug. 28, 2020 shows the exhibition area of Guangzhou Automobile Group Co., Ltd. (GAC Group) during the 28th Guangzhou Fair in Guangzhou, south China's Guangdong Province. The four-day Guangzhou Fair kicked off here on Friday. (Xinhua/Deng Hua)

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Face masks and shields are displayed during the 28th Guangzhou Fair in Guangzhou, south China's Guangdong Province, Aug. 28, 2020. The four-day Guangzhou Fair kicked off here on Friday. (Xinhua/Deng Hua)

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People view an intelligent nursing bed during the 28th Guangzhou Fair in Guangzhou, south China's Guangdong Province, Aug. 28, 2020. The four-day Guangzhou Fair kicked off here on Friday. (Xinhua/Deng Hua)

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People watch an autonomous driving vehicle during the 28th Guangzhou Fair in Guangzhou, south China's Guangdong Province, Aug. 28, 2020. The four-day Guangzhou Fair kicked off here on Friday. (Xinhua/Deng Hua)