英文關鍵字
assembly
beam
bottom
business
cab
camera
compartment
container
conveyor
crane
defocus
development
engine
engines
equipment
factory
field
focus
gas
heavy
hoses
industry
located
machine
modern
motion
motors
movemen
movement
moving
near
outboard
parts
passage
people
perspective
process
production
service
shift
shop
small
system
technology
the
tractor
tractors
tread
wheel
wheels
work