英文關鍵字
absorb
agriculture
chemical
chemistry
clean
contaminated
contamination
copper
damage
danger
dangerous
dead
desert
dig
dirt
dirty
drought
earth
ecology
environment
environmental
factory
garbage
garden
gardening
ground
healing
heavy
help
industrial
industry
land
man
metal
nature
oil
poison
poisoning
polluted
pollution
protect
reflection
soil
surface
tool
toxic
treatment
waste
water
work