By contrast, the total human population on Earth was no more than a few million until a few thousand years ago.
相比之下，直到几千年前为止，地球上的人口不过区区数百万。
In my father's lifetime, the world's population went from 2 billion to 6 billion-so my father was alive for a tripling of the total human population.
在我父亲的有生之年里，全球人口从20亿增长到了60亿，他是作为这翻了三番的人口中的一员而活在这个世界上的。
Urbanization, the urban population accounts for the increasing proportion of the total population trends, is becoming one of the most important features of the progress of human society.
城市化是城市人口占全部人口的比重不断增加的趋势，正在成为人类社会进步的最主要特征之一。
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