英文關鍵字
water
liquid
pipe
equipment
industry
symbol
chlorine
purification
icon
factory
motion
clean
industrial
graphic
animation
pictogram
filtration
hd
animated
item
sign
pipeline
storage
system
pump
filtering
ultraviolet
station
tank
purity
strainer
plumbing
treat
piping
supply
purified
effluent
filtered
black