英文關鍵字
arab
arabian
barrel
benzine
biohazard
cask
chemical
chemistry
cistern
container
contamination
danger
diesel
dirt
dirty
drum
dust
ecology
energy
environment
fuel
gallon
garbage
gas
gasoline
green
industrial
industry
iron
metal
minaret
mosque
oil
oilfield
old
petrol
petroleum
pollution
resource
rust
rusty
shortage
steel
stone
tank
toxic
vat
waste
wilderness