英文關鍵字
adult
caucasian
clean
collect
consumer
container
disposal
eco
ecological
ecology
environment
environmental
garbage
green
litter
littering
male
man
materials
modern
outdoors
package
person
plastic
pollution
protect
recycle
recycling
reduce
refuse
responsible
reuse
rubbish
segregation
selective
separation
sign
sorting
standing
street
sustainable
throw
throwing
trash
urban
used
utilization
wall
waste