Epidemic prevention materials production companies in Helong have been producing medical supplies at full capacity to meet domestic and foreign demands during the fight against the novel coronavirus epidemic. (Photos: Xinhua)

A worker checks the quality of lenses of medical protective goggles at a factory of a company in Helong, Yanbian Korean Autonomous Prefecture, northeast China's Jilin Province, May 6, 2020.

A worker produces medical protective goggles at a factory of a company in Helong, Yanbian Korean Autonomous Prefecture, northeast China's Jilin Province, May 6, 2020.

A worker produces medical protective goggles at a factory of a company in Helong, Yanbian Korean Autonomous Prefecture, northeast China's Jilin Province, May 6, 2020.

Workers produce medical protective goggles at a factory of a company in Helong, Yanbian Korean Autonomous Prefecture, northeast China's Jilin Province, May 6, 2020.

A worker produces medical protective goggles at a factory of a company in Helong, Yanbian Korean Autonomous Prefecture, northeast China's Jilin Province, May 6, 2020.

A worker checks the quality of lenses of medical protective goggles at a factory of a company in Helong, Yanbian Korean Autonomous Prefecture, northeast China's Jilin Province, May 6, 2020.

Workers produce medical protective goggles at a factory of a company in Helong, Yanbian Korean Autonomous Prefecture, northeast China's Jilin Province, May 6, 2020.