Life on Earth will become unsustainable unless population growth is held in check.
地球上的生命将无法延续，除非人口增长得到控制。
The population of the earth is increasing very fast.
地球上的人口增加得很快。
The population of the earth is growing very fast.
地球的人口正快速增长。
The population on Earth is still increasing quickly.
地球上的人口仍然在快速增长。
This year, planet Earth will reach a new population milestone.
今年地球将会迎来人口数量的一个新的里程碑。
The population on the earth is increasing fast.
地球的人口正快速增长。
The increase in population made it hard for the earth to support so many people.
人口的增长使地球很难承受如此多的人。
Humans must make the earth support the increasing population.
人类必须使地球养活的人口不断增加。
Humans must make the earth support the increasing population.
人类必须使地球养活的人口不断增加。
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