英文關鍵字
aqueduct
blue
cargo
channel
chemical
clouds
cloudscape
conduct
conduit
construction
delivering
delivery
desert
dollar
duct
energy
engineering
equipment
factory
fossil
fuel
fueling
gas
gasoline
gaspipe
land
line
lybia
metal
mineral
money
nature
oil
passage
petrol
petroleum
pipe
pipeline
piping
production
refinery
region
russia
sahara
siberia
sky
stone
summer
system
technology
transport
transportation
tube
usinsk
water