英文關鍵字
chemical
chemistry
clean
container
control
ecology
environment
equipment
factory
faucet
filter
filtering
filtration
flow
gage
huge
indoors
industrial
industry
iron
knob
liquid
lot
machine
modern
new
pipe
pipeline
plant
pollution
preparation
pressure
process
processing
purification
purified
reservoir
sedimentation
settle
steel
storage
system
tank
technology
tool
treatment
tube
utility
valve
water