紡錘
environmental
background
boiler
boilerhouse
bolt
bolted
chemical
condensation
connection
construction
economy
energy
engineering
environment
equipment
facility
factory
handle
heat
heavy
hot
industrial
industry
iron
isolate
isolated
joint
mechanical
metal
modern
non return
nut
parts
pipe
pipeline
plant
power
pressure
production
pump
pumping
return
rusty
stainless
steam
steel
supply
system
systems
technology
twin
valve
valves
warming
water
work