population concentration

• 人口集中

population concentration的用法和样例：

例句

1. Our population is concentrated in the big cities.
   我国人口集中在大城市里。
2. The oil industry is marked by an element of danger, hence the siting of refineries at a distance from population centres.
   石油工业的特征是它有一点点危险性，所以炼油厂的厂址总在远离人口集中的地方。