英文關鍵字
agricultural
agriculture
closeup
countryside
drain
drainage
drop
ecology
environment
environmental
farm
farmer
farmland
flow
flowing
fluid
grass
groundwater
gushing
irrigation
leaky
liquid
natural
nature
outdoor
pipe
pipeline
plant
plantation
plumbing
pollution
pouring
pump
pvc
ripple
rural
sewage
sewer
slow
spill
stream
summer
supply
tropical
tube
tunnel
underground
waste
water
wet