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