The medical protective supplies fair held here on Wednesday has attracted some 600 exhibitors. (Photos: Xinhua)

A staff member stands next to a KN95 face mask machine in the Guangzhou international medical protective supplies fair at Poly World Trade Center Expo in Guangzhou, south China's Guangdong Province, June 10, 2020.

A face mask machine is displayed in the Guangzhou international medical protective supplies fair at Poly World Trade Center Expo in Guangzhou, south China's Guangdong Province, June 10, 2020.

Various types of personal protective equipment are displayed in the Guangzhou international medical protective supplies fair at Poly World Trade Center Expo in Guangzhou, south China's Guangdong Province, June 10, 2020.

Visitors view a face mask machine in the Guangzhou international medical protective supplies fair at Poly World Trade Center Expo in Guangzhou, south China's Guangdong Province, June 10, 2020.

A staff member (L) briefs clients on face mask raw material and techniques in the Guangzhou international medical protective supplies fair at Poly World Trade Center Expo in Guangzhou, south China's Guangdong Province, June 10, 2020.