a population bulge

• 人口膨胀

a population bulge的用法和样例：

例句

1. There was a swell in the city's population.
   该市出现过人口膨胀。
2. Population dilatation, resource absence and environment deterioration are three main questions in the world.
   人口膨胀，资源短缺，环境恶化是当今世界面临的三大问题。