When the coronavirus pandemic began, the challenge for Pfizer and BioNTech wasn't just developing a Covid-19 vaccine -- they also had to make it, and by the hundreds of millions.
원문출처 : https://www.cnn.com/2021/03/31/health/pfizer-vaccine-manufacturing/index.html
원문출처 : https://www.cnn.com/2021/03/31/health/pfizer-vaccine-manufacturing/index.html