英文關鍵字
pool
round
photography
reflection
store
abstract
storage
electricity
industrial
power
flowing
flow
ecology
clear
purity
treatment
environmental
recycling
usa
strength
biology
waste
Panorama
Pollution
production
system
flood
deep
engineering
uk
Accessibility
utility
control
drought
factory
low
queen
filter
tank
removal
england
california
scottish
layered
sanitation
scotland
flooding
Color Image
no people
aerial view