因为那时世界的总人口数量很小，早期的社会可以在孤立状态下存活。
Because the world's total population was small, the earliest societies were able to survive in isolation.
当一个国家的城市人口数量超过总人口数量的50%时，我们就可以称之城市化国家。
When the country's urban population takes up more than 50% of the total population, we can say our country is an urbanized country.
按照目前的发展趋势来看，在未来50年左右，我们的总人口数量将很有可能从1.3亿下降到9000万以下。
Given present trends, total population will likely decline from around 130 million to under 90 million in 50 years or so.
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