英文關鍵字
no
people
alpha
channel
mask
allows
make
video
image
transparent
coronavirus
covid
footage
virus
epidemic
pandemic
protective
infection
animation
liquid
protection
quarantine
flu
motion
corona
disease
medical
digital
prevention
英文關鍵字
no
people
alpha
channel
mask
allows
make
video
image
transparent
coronavirus
covid
footage
virus
epidemic
pandemic
protective
infection
animation
liquid
protection
quarantine
flu
motion
corona
disease
medical
digital
prevention