英文關鍵字
activity
bulldozer
clay
coal
color
construction
contruction
digging
dirt
dredging
earth
eathmoving
equipment
heavy
horizon
hydraulic
industry
land
light
loading
machinery
medicine
mine
mineral
mining
mover
openpit
orange
ore
outdoors
people
pit
platform
product
quarry
site
size
sky
strength
sun
sunlight
technology
tracktype
tractor
truck
vehicle
waste
working
yellow