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信息发布者：
paper
pollution
prediction
future
pollute
environment
planet
earth
plant
part
peace
sea
build
sky
pollution
prediction
built
peace
on computers
free time
in great danger
on the earth
play a part
world peace
Will
in
100
years
won't
will
be
free
will
live
to
be
prediction
about
What
be
like
more
crowded
polluted
in
great
danger
move
to
less
more
play
a
part
in
saving
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