A . an overpopulated earth will be unable to sustain its inhabitants 人口过剩的地球无法维护它上面的居民。
2.
The crisis of overpopulation is still the main problem we are facing today 但我们今天面临的主要问题仍是人口过剩的危机
3.
Why is marriage and kids so important ? there ' s an overpopulation problem 为什么婚姻和孩子如此重要？这会导致人口过剩的问题
4.
Never before in history has the issue of overpopulation been more evident than now 历史上，人口过剩的问题从来没有比现在更加突出。
5.
World commerce was the chief compelling force in bringing about this change from public to private ownership 加以土地越来越集中，耕作方式又十分落后，自然加深了农业人口过剩的危机。
6.
He accounted for their relatively small numbers as being due to the implementation of some form of birth control to eliminate the problems of overpopulation 对于他们相当稀少的人口，旅行者认为这是因为节育的成功，消除了人口过剩的问题。
