輸出する
environmental
blue
brown
business
care
cheap
construction
crude
cylinders
diesel
economical
economics
economy
efficient
energy
environment
extract
extracting
fuel
gas
gasoline
globalwarming
heaven
industry
iron
irrigation
need
oil
petrol
pipe
pipeline
piping
pollute
polluting
pollution
power
produce
product
protect
pump
pumping
rigging
rust
rusty
sky
steel
straight
structure
supply
torque
transport
transportation
tube
waste
water