英文關鍵字
abstract
background
blue
business
circle
connection
construction
design
down
equipment
factory
fuel
gas
geometric
granule
graphic
industrial
industry
iron
machine
manufacturing
mechanism
metal
modern
nut
oil
pattern
pipe
pipeline
pipes
piping
plant
plumber
plumbing
power
pressure
production
products
pump
recycling
special
stainless
steel
system
technology
template
tube
valve
water