“Vaccine hesitancy”was listed by the World Health Organization as one of the top ten global threats in 2019," with one in every five families falling into vaccine hesitancy. Amid the COVID-19 epidemic, people are beginning to rethink the issue of vaccines: 1. Vaccines are an effective tool to prevent diseases and fight against pandemics. Why do people refuse to get vaccinated? 2. What is vaccine hesitancy? What causes vaccine hesitancy? 3. What events changed people’s determination and attitudes, and how are the conflicts between people, society, and vaccines intertwined?