摘要
In 2020,humans suffered the most tragic year in recent history due to the coronavirus disease 2019(COVID-19)pandemic-the loss of millions of lives,the worldwide financial crisis,the polarization of domestic politics in many countries,the disruption of the international transportations,and the downturn in global collaborations.Each of us has experienced the fear,the powerlessness,the depression,and the sacrifice of individual freedoms.Now,thanks to the miracle breakthroughs of severe acute respiratory syndrome-associated coronavirus 2(SARS-CoV-2)vaccines,we are seeing the light at the end of this long and dark tunnel.
