英文關鍵字
abstract
apart
asphalt
background
beautiful
brass
bronze
building
close
connection
construction
copper
cuts
cutter
design
destruction
detail
engineering
equipment
ferrous
fittings
fly
house
industrial
industry
layer
machine
many
material
metal
metallic
milling
motion
non
old
part
pieces
pipe
pipeline
plumber
plumbing
repair
road
sale
sanitary
screw
service
set
shelf
shop
silver
slow
small
stand
steel
stone
supermarket
surface
tee
tool
valve
water