英文關鍵字
aerosol
automatic
clinic
cold
common
concept
coronavirus
covid19
disease
diseases
drill
epidemic
fun
hazards
health
hood
indoor
infected
infection
intact
liberal
lion
look
mask
medical
meeting
modern
n1h1
paint
portrait
protect
protection
protective
respirator
safety
satisfactory
scientific
scientist
security
spray
tetanus
threat
tiresome
virologist
virus
wearing
woman