People visit the China International Public Health Security Epidemic Prevention & Protection Materials (Guangzhou) Fair at Guangzhou International Sourcing Center in Guangzhou, south China's Guangdong Province, Aug. 5, 2020. Over 800 related companies participated in the exhibition. (Xinhua/Lu Hanxin)

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A buyer negotiates with an exhibitor at the China International Public Health Security Epidemic Prevention & Protection Materials (Guangzhou) Fair at Guangzhou International Sourcing Center in Guangzhou, south China's Guangdong Province, Aug. 5, 2020. Over 800 related companies participated in the exhibition. (Xinhua/Lu Hanxin)

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People visit the China International Public Health Security Epidemic Prevention & Protection Materials (Guangzhou) Fair at Guangzhou International Sourcing Center in Guangzhou, south China's Guangdong Province, Aug. 5, 2020. Over 800 related companies participated in the exhibition. (Xinhua/Lu Hanxin)

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People visit the China International Public Health Security Epidemic Prevention & Protection Materials (Guangzhou) Fair at Guangzhou International Sourcing Center in Guangzhou, south China's Guangdong Province, Aug. 5, 2020. Over 800 related companies participated in the exhibition. (Xinhua/Lu Hanxin)

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A man visits the China International Public Health Security Epidemic Prevention & Protection Materials (Guangzhou) Fair at Guangzhou International Sourcing Center in Guangzhou, south China's Guangdong Province, Aug. 5, 2020. Over 800 related companies participated in the exhibition. (Xinhua/Lu Hanxin)

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A buyer negotiates with an exhibitor at the China International Public Health Security Epidemic Prevention & Protection Materials (Guangzhou) Fair at Guangzhou International Sourcing Center in Guangzhou, south China's Guangdong Province, Aug. 5, 2020. Over 800 related companies participated in the exhibition. (Xinhua/Lu Hanxin)

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A buyer negotiates with an exhibitor at the China International Public Health Security Epidemic Prevention & Protection Materials (Guangzhou) Fair at Guangzhou International Sourcing Center in Guangzhou, south China's Guangdong Province, Aug. 5, 2020. Over 800 related companies participated in the exhibition. (Xinhua/Lu Hanxin)

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People visit the China International Public Health Security Epidemic Prevention & Protection Materials (Guangzhou) Fair at Guangzhou International Sourcing Center in Guangzhou, south China's Guangdong Province, Aug. 5, 2020. Over 800 related companies participated in the exhibition. (Xinhua/Lu Hanxin)