英文關鍵字
blurred
cement
constructing
construction
crane
crushed
crushing
daytime
development
digger
digging
earth
equipment
excavation
extraction
falling
forest
geology
green
greenery
grind
grinding
gritty
hardwork
heap
heaps
heavy
industrial
industry
machine
machinery
manufacturing
material
mining
muddy
pile
pit
production
refine
refining
rock
rocks
rocky
site
stone
stones
technology
transportation
working