英文關鍵字
adult
attractive
background
caucasian
cellular
communication
connection
dangerous
disease
epidemic
face
gray
health
healthcare
high
hold
human
illness
infected
infection
information
international
internet
life
look
male
man
mask
medical
medicine
motion
networks
people
person
phone
prevention
protect
protection
protective
quality
respiratory
risk
safety
searching
sickness
slow
smartphone
social
symptoms
technology
telephone
types
typing
use
virus
walk
wearing
young