英文關鍵字
2019ncov
air
boy
care
caucasian
child
childhood
city
concept
corona
coronavirus
covid19
crowd
danger
environment
epidemic
europe
face
global
healthcare
healthy
infection
kid
male
mask
masks
medical
medicine
outdoor
pandemic
pneumonia
portrait
prevention
problem
protect
protection
protective
respiratory
safety
sick
street
teenager
vaccine
virus
wearing