population 可数名词,还是不可数名词?

population是不可数名词n。人口,(全体)居民,群体We have a growing population and therefore we need more food。我们的人口在增长,因此我们需要更多的食物。The entire population was wiped out by the terrible disease。所有的居民都被可怕的疾病夺去了生命。The main impediment to development is the country's large population。发展的主要障碍是这个国家人口太多。There has been a steady decrease in population in this city。这个城市的人口在持续下降。