英文關鍵字
blue
conservation
convert
cycle
dirty
disposal
drainage
effluent
environment
facility
factory
human
industrial
industry
infrastructure
pipe
pipes
plant
plants
pollution
process
purification
reclamation
recycle
recycling
sewage
solid
station
system
tank
technology
treatment
used
valsve
valve
valves
waste
wastewater
water
works
wtp
wwtp