Vital statistics have helped identify major trends in fertility, child survival and child mortality.
关键统计数据可以帮助我们发现生育率、儿童存活率和死亡率方面的主要趋势。
With no net immigration, and fertility rates more or less where they've been for the past 35 years, the Bureau of Statistics estimates that our population in 2050 would be roughly the same as now.
刨去移民因素，如果生育率和过去35年持平的话，统计局估计到2050年时候，我们的人口将和现在差不多。
Rural fertility rates are believed to be higher than china ' s statistics show , since many children are concealed from census takers.
农村生育率肯定比中国的统计数字要高，因为在人口普查中很多孩子被隐瞒了。
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