1. a change in the relative numbers of the different groups of individuals making up a population. 
   组成人口的不同个体群之间相对数的变化。
2. The socialist system on the mainland, with its population of one billion, will not change, ever.  
   十亿人口大陆的社会主义制度是不会改变的，永远不会改变。
3. In order to better understand the law governing and trend of the population change, further slow-down population growth, improve population quality, and properly formulate a population policy and social and economic development plan for the 21st century, the Chinese Government conducted its fifth national population census in November 2000.  
   为比较准确地把握人口变化的规律和趋势，进一步控制人口增长，提高人口素质，正确制定面向二十一世纪的人口政策和社会经济发展规划，中国政府于2000年11月开展了第五次全国人口普查。
4. Now, China's urban population has basically accomplished the change-over to the population reproduction pattern characterized by low birth rate, low death rate and low growth; and the rural population is currently in this process of change-over.  
   目前，中国城市人口已基本实现了向低出生、低死亡、低增长的人口再生产类型的转变，农村人口正处于这一转变过程中。
5. But we must likewise reckon with the second kind of change on the enemy's side, a change for the better, that is, his expansion in territory, population and resources.  
   然而也要估计到敌人的第二种变化，即向上的变化。那就是他扩大了领土、人口和资源。

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