the fact of a country or city, etc. having too many people for the amount of food, materials, and space available there

Overpopulation is one of the country's most pressing social problems. 人口过剩是该国最紧迫的社会问题之一。

People are dying because of overpopulation, poverty, and disease. 人们正在因为人口过剩、贫穷和疾病而死去。