英文關鍵字
caucasian
city
clean
colorful
container
disposal
ecological
ecology
environment
environmental
garbage
green
hand
litter
man
modern
outdoor
package
people
person
plastic
pollution
protect
protection
recycle
recycling
reduce
refuse
responsible
reuse
rubbish
segregation
selection
separate
separation
sorting
throw
throwing
trash
urban
used
utilization
waste