英文關鍵字
pipe
boiler
system
industry
plant
pipeline
steel
interior
production
factory
tube
industrial
engineering
equipment
control
pump
valve
technology
pressure
machine
filter
building
chemical
purification
quality
treatment
recycle
technical
purity
heat
maintenance
ecology
filtration
pollution
absorbing
infrastructure
energy
machinery
waste
modern
clean
recycling
biofuel
renewable
sawdust
organic