英文關鍵字
disease
epidemic
mask
medical
medicine
pandemic
protection
quarantine
concept
tree
corona
flu
infection
problem
virus
health
garbage
nature
environment
park
environmental
pollution
safety
ecology
dirty
used
recycling
hanging
rubbish
wood
discarded
danger
closeup
outdoor
plant
blue
green
flora
leaf
forest
spring
garden
contamination
risk
trash
disposable