英文關鍵字
aqueduct
big
building
business
clean
clearing
conduit
coniferous
construction
culvert
deforestation
destruction
diameter
drinking
duct
ducting
engineering
equipment
forest
forests
fresh
industrial
industry
large
laying
line
long
nord
northern
panorama
pipe
pipeline
piping
plastic
power
raceway
stream
supply
technology
tube
tubing
water
watercourse
woodn