英文關鍵字
benzine
blue
duct
essence
exchange
expensive
extract
field
gas
gasolene
gasoline
gold
golden
gum
lack
maintenance
minerals
naphtha
oil
oscillate
pendulum
petrol
petroleum
pipe
plant
point
pomp
pump
repair
repairman
resin
rich
rig
rock
rockoil
rubber
servant
sky
stage
station
tar
tower
trumpet
tube
ukraine
wheat