英文關鍵字
accessibility
asphalt
auger
cement
circle
city
concrete
construct
construction
covering
danger
dirty
drill
garbage
gutter
hole
industrial
industry
iron
lid
manhole
metal
metallic
obsolete
old
open
pipe
protection
repair
repairing
road
roadside
rough
rusty
safety
sewage
sewer
sign
steel
stone
street
transportation
underground
urban
warning
water
wayside
work
worker
working