The world’s population reached the 8bn mark this month, but it had already passed two other significant milestones: the total number of people aged under 15 has peaked at 2bn, and more than half of us now reside in cities.
本月,manbetx app苹果 人口突破80亿大关,但有关这件事的讨论超过了另外两个重要里程碑:15岁以下人口总数达到20亿的峰值,而且我们中一半以上现在居住在城市。
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