英文關鍵字
abandoned
across
aqueduct
architecture
blue
bridge
building
cable
canal
channel
colorado
connection
construction
countryside
culvert
current
ditch
dual
farm
farmland
footbridge
gas
grass
infrastructure
irrigation
litter
maintenance
metal
nobody
old
payd
pipe
pipeline
protection
river
road
round
rural
sky
spring
steel
structure
systems
through
transfer
transportation
tunnel
water
wild
yellow