第15页

信息发布者：
possibility
possible
alien
stranger
strange
be aware of
circle around
reach an agreement
think about moving 
to another planet
build an indoor playground
two
Earth
years
to
circle
around
in
agreement
be
possible
in
no
doubt
very
interesting
not
sure
percentage
disadvantage
advantage
risk
do a survey
move away from the Earth
miss the first part of
start with a discussion
be afraid of aliens
be worth taking a risk
get sick from living on Mars
try to use new grammar rules
improve my listening skills
after all
move
away
from
the
Earth
live
on
another
planet
it's
worth
the
risk
After
all
goods
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