英文關鍵字
asphalt
city
collector
construction
cover
dirty
drain
drainage
flowing
garbage
grate
grunge
industrial
iron
manhole
metal
nature
pavement
plumbing
rain
road
roadside
sewage
sewer
sewerage
spring
steel
storm
urban
water
英文關鍵字
asphalt
city
collector
construction
cover
dirty
drain
drainage
flowing
garbage
grate
grunge
industrial
iron
manhole
metal
nature
pavement
plumbing
rain
road
roadside
sewage
sewer
sewerage
spring
steel
storm
urban
water