英文關鍵字
culvert
pipes
drainage
storm
channels
orange
landslide
stone
wall
system
hole
pass
underground
uttarakhand
dehradun
india
construction
deforestation
engineering
civil
cement
plastic
tunnel
flow
dry
brick
big
mountains
urban
rural
asia
water
harvesting
monsoon
concrete
retaining
background
ditch
green
ground
outdoor
pavement
pipe
road
structure
tube
wing
cinematic
video
slow
motion