英文關鍵字
area
bench
boulders
business
cement
conditions
cracking
crumbling
destruction
earth
excavate
excavator
flat
fragments
geology
heap
natural
quarry
resource
rock
rocks
rocky
rough
symmetrical
英文關鍵字
area
bench
boulders
business
cement
conditions
cracking
crumbling
destruction
earth
excavate
excavator
flat
fragments
geology
heap
natural
quarry
resource
rock
rocks
rocky
rough
symmetrical