英文關鍵字
activity
backhoe
bucket
bulldozer
conservation
construction
destruction
digger
digging
draws
dredger
dump
dust
equipment
excavation
excavator
gravel
heavy
hydraulic
industrial
industry
iron
loader
machine
machinery
manual
mechanical
mining
mover
objects
operator
pollution
power
scoop
shovel
tractor
wheel
work
yellow