英文關鍵字
activity
bright
business
construction
crane
dirty
drill
electric
engine
engineering
equipment
flaming
fuel
gear
generation
generator
heavy
industrial
industry
iron
large
machine
manufacturing
metal
mill
mover
objects
obsolete
old
organization
overweight
part
plate
power
reducer
reduction
rubber
rusty
shiny
spark
stamp
steel
strength
supply
technology
video
warehouse
welder
welding