Workers make protective masks at a mask plant of Chinese underwear brand Threegun Group in Shanghai, east China, April 8, 2020. The mask production of the company has kicked into high gear recently with the daily output reaching one million pieces. (Photos: Xinhua)

A worker makes protective masks at a mask plant of Chinese underwear brand Threegun Group in Shanghai, east China, April 8, 2020. The mask production of the company has kicked into high gear recently with the daily output reaching one million pieces.

Workers make protective masks at a mask plant of Chinese underwear brand Threegun Group in Shanghai, east China, April 8, 2020. The mask production of the company has kicked into high gear recently with the daily output reaching one million pieces.

Workers pack protective masks at a mask plant of Chinese underwear brand Threegun Group in Shanghai, east China, April 8, 2020. The mask production of the company has kicked into high gear recently with the daily output reaching one million pieces.