英语听力精选进阶版 13622（在线收听）

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