英文關鍵字
agriculture
background
closeup
color
construction
day
dirty
ecology
environment
factory
farm
field
flows
from
grass
green
growth
into
landscape
lighting
meadow
natural
nature
outdoors
people
pipe
plant
pollutes
pollution
pouring
real
river
riverpollutes
rural
spring
summer
sunny
time
treatment
wastewater
water