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（单词翻译）
Countdown to seven billionth baby
Vocabulary
projections
calculations and estimates
the milestone
the significant number
to take stock of
to think carefully about something with a view to developing a policy about it
trends
changes over time
the voracious appetite of
the using up of resources at a very fast rate
fertility rate
average number of children born to each woman
access to
availability of
to boost
to increase and improve
address
find an answer to the problem of
the demography
the high birthrates in undeveloped countriesthe high birthrates in undeveloped countries
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