英文關鍵字
block
bulldozer
construction
cube
cut
digging
dump
dust
earth
engine
environment
equipment
excavator
extraction
factory
gear
granite
gravel
hard
hardness
heavy
industrial
industry
job
landscape
machine
machinery
manufacture
marble
material
mechanism
metal
mineral
mining
mountain
natural
nature
people
pit
power
powerful
quarry
raw
rock
rubble
steel
stone
technical
technology
work