英文關鍵字
automobile
blade
building
bulldozer
class
construction
crushed
earth
earthmover
engine
environment
equipment
excavator
furniture
grader
gravel
ground
heavy
industrial
industry
land
large
leveling
machine
metal
motor
motorized
repair
road
roads
roadworks
rock
shovel
spread
stone
technical
technology
tractor
wheel
work
worker
yellow