the
more
we
learn
about
the
body's
defense
system,
the
more
we
realize
what
a
marvellous
force
it
is.
我们对身体的防卫系统研究得越多，就越认识到它是一个多么不可思议的力量。
then
the
more
they
think
about
it,
they
realize
,
no,
not
maybe
right,
some
version
of
it
has
to
be
right!
后来随着思考越发深入，他们意识到，哦不，这不仅有可能是对的，而且某些观点肯定是对的！
because
they
realize
that
migrants
contribute
a
lot
to
the
economy
once
they
are
at
the
peak
of
their
growth.因为他们认识到,很多移民处于成长的巅峰时为经济做出了许多贡献。
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