英文關鍵字
aerial
bad
bush
chaff
combe
damaged
danger
dirty
disposal
dross
dry
dump
earth
ecology
environmental
garbage
global
grass
heap
household
impurity
junk
land
landfill
landscape
litter
locality
loss
meadow
mess
midden
nature
package
plastic
poison
pollution
ravine
recycle
refuse
renaturation
rubbish
sanitary
sunset
terrain
toxic
trash
treatment
utilize
warming
wastage